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This is a "Wild Mass Guess" entry, where we pull out all the sanity stops on theorizing. The regular entry on this topic is elsewhere. Please see this programme note.
Adventure Time
What time is it? CRACKPOT THEORY TIME!

See more guessing on the analysis page.

Warning: Spoilers ahead.


A part of Darren's consciousness is now inside Finn's head
When Finn appears after defeating Darren, he is a bit slower and says "Guacamole" strangely, as if he wasn't familiar with the word...

Maja is Shoko's mother
For a start, there's a fair bit of physical resemblance between the two. Both have green skin, black hair, and have hints of an oriental look to them. There's also a picture of Shoko's ghost form in Maja's house, which may hint at a connection. Shoko's parents were said to be cruel towards her, to the point that the concept of parental love confused her, but if Maja was her mother, it might be worse than that. Maja apparently gains power through emotions, so she may have been deliberately making Shoko's life miserable to use her as a power source.

Finn's new arm isn't normal
If you look closely at it, it has what looks like a thorn just on the palm, when he first grows it back, and it's still covered in honey. Maybe it'll just fall off, or maybe Finn's arm now has some sort of grass blade related power.

Billy didn't tell Finn about Martin, the Lich did
Oh, come on. If Billy's so all knowing and wise, there's no way he would send Finn off to go rescue someone who apparently has committed crimes sufficient to be comparable to an Earth-Shattering Kaboom to a seemingly inhabited planet, especially if it would result in Finn being trapped in an inescapable crystal prison. On the other hand, the Lich had nothing but to gain from the situation. Sure, he might not have known that Finn would bring Prismo to him, but Finn being stuck in the Citadel not only allows him to get rid of what he perceives as nuisance, it also give him a chance to observe the process of getting into the Citadel and possibly to even follow him in. After all, it only make sense they go to Prismo to find a way in, as it had been implied that Jake had been spending a good bit of time at his place recently, and he's the only one they know with advanced universal knowledge. Billy had nothing to do with it.

Martin genuinely couldn't care less about Finn and is as much as a bastard as he seems
It's apparently a hard concept for some to swallow, between the attempts to justify Martin's actions and the attempts to paint Bubblegum's motives with regards to Lemongrab as more sentimental than she herself has stated to be capable of ("undifferentiated love", remember), but some parents just don't feel parental towards the individuals who view them as parents. Finn losing his arm wasn't something Martin could have possibly predicted, and he didn't intend it, it just happened, so it's highly unlikely he was trying to "unlock Finn's true potential" by making him an amputee. He barely blinked when Finn was stated to be his son, and barely seems to remember leaving a baby in the woods. Martin was probably imprisoned in the Citadel for a reason, and a complete lack of empathy wouldn't be out of place for someone capable of committing a cosmic crime. Even Finn's apple likely doesn't fall as far from the tree as one would think, as in recent seasons he's been shown to have a nastier, more unstable side than was apparent early on. Things aren't actually that simple and nice in Adventure Time.

Princess Bubblegum had a part in locking Martin up in the Crystal Citadel
We already know from the Shouko story that PB is several hundred years old, more than old enough to be around when Finn's dad was imprisoned. In the episode 'The Tower' she disguises herself as Martin to trick Finn. She successfully disguises herself as someone when she wasn't there the only time he was on screen. The only logical explanation is that PB knew Martin from before the episode and also knew that he was Finn's father. She had to have been there when he was locked up because she knew what he was wearing when it happened.

Martin was trying to help Finn
First off, why did Finn get his arm torn off? Because he was trying to reconnect with his dad (literally). Why was he trying to reconnect with his dad? Because he hadn't seen him in so long and he finally found him after 14 or so years of searching. How did he know where to find his dad? Because Billy told him. And now the big question here is, why would Billy, the legendary hero of Ooo and pretty much the nicest guy ever, the face of moral epitude, tell a 15-year-old boy where his long-lost father is, KNOWING his father's an abusive, selfish jerkwad, and not even bothering to mention this fact to Finn?!

Logically, Martin must not be that bad of a guy to begin with.

So why was he locked up in the citadel?! The answer's actually in the episode itself... Martin explicitly says that the Guardian's blood has "the good nooch" that keeps everyone locked up alive and well. Martin intentionally committed a cosmic crime to lock himself up, since he knew it was the only way he'd last long enough to see his son.

So why would he rip Finn's arm off after finally getting to meet his son for the first time in... what, forever?! The answer seems to manifest itself in "The Tower", where Finn grows a new "phantom", telekinetic arm through, apparently, sheer brainpower. PB mentions in the same power that the energy from his arm is SO POWERFUL... it's unstable and has the potential to hurt himself and others. We've also seen in the same episode that Finn appears to manifest it in times of extreme emotional stress, in this case, thinking about his dad. The arm "disappears" by the end of the episode, but the more likely explanation is that the arm lost power and "faded away", at least temporarily, after PB calms Finn down and knocks some sense into him. We can still see the shadow of the arm when Finn approaches Jake afterwards, hinting that it may not be completely gone and can still return... we know that there's going to be at least 6 more Martin-related episodes in the season, and I'm expecting Finn's "phantom" arm to make SOME sort of reappearance in these episodes.

I'm thinking here that Martin INTENTIONALLY ripped Finn's arm off in order for Finn to achieve his full potential with his new "phantom" arm. He probably knew that his son would adopt some sort of special powers (possibly from the mom?!) and knew that this was the only way to do it, possibly to give Finn the power to defeat some BIGGER bad than the Lich King in the future. In the end, Martin was just trying to do what's best for his son, and undoubtedly it hurt him as much as it hurt Finn.

Finn's dad is the big bad or not really is dad
He seems pretty evil even though he is Finn's dad, I mean he had to commit a COSMIC CRIME to end up in the Citadel so I don't doubt that he's evil. But just think of how epic it would be for Finn's dad to be the big bad although I guess a bit cheesy with the ultimatum of helping your dad or killing him for the greater good. Either that or this is not Finn's dad. It just seems too weird that he's Finn's dad. He even seemed to not really know anything about Finn during the Citadel episode. Whatever the case is something epic is going to happen with Finn's dad. But I also guess we are going to have to wait awhile to learn more about Finn's dad.

Martin the Human is Pals with Hunson Abadeer
Mavin's been traveling The Multiverse around to be a cosmic criminal, so why wouldn't he wind up n the Nightosphere sooner or later? You've got to admit that they've basically got the exact same personality. Can't you just imagine them having a few beers together? Just picture it, A Man and His Soul-Sucking Lord of Evil!

Finn's been an amputee since the series started
Finn has been wearing a super-realistic super-advanced artificial arm this entire time. In the episode Escape From The Citadel his artificial arm was pulled off, leaving the old healed stump. There are many ways Finn could have lost his arm in the dangerous world he lives in (injury, infection, etc). Two reasons for this theory: Finn's arm looks like an old amputation and not a new wound, and it would explain why Finn imagines himself as an adult with a robot arm as he would eventually outgrow the one he had.
  • The reason his torn arm healed over immediately is because of the Citadel Guardian's blood. If it can turn The Lich into a living baby-thing, it can certainly heal over an amputated limb.

Finn is going to grow his own arm
After the Grass Blade took his arm the drop of Guardian blood hit his arm and sprouted a flower, implying there is still a trace of the Grass Blade attached to him. Over the season (or maybe even between episodes) Fin is going to sprout a replacement plant arm rather than get a mechanical arm built by Bubblegum.

Finn's Father's return was specifically timed:
Finn's father is returning from presumed death the day after Easter. Take that as you will...

Adventure Time's Guionists checks this very same WMG page, awaiting for someone to put a theory about...
Betty using Bubblegum's Time Machine to restore Simon's mind and youth. Come on. I can see you here, guys!

Adventure Tim has a fear of lakes, like Finn's fear of the ocean
Because his arch nemesis is a lake.

The Grass Blade is the reason Finn losses his arm
It has been severely teased across the show that Finn will lose his right arm, as his every incarnation has until now (except Fionna, but she must likely will lose it after Finn has). And now he is cursed with an irremovable sword on his right hand, when he loses the Grass blade his arm is coming off.
  • Yep, it happened.

Young Marcy really was close to death in "Simon and Marcy"
And Simon was looking for some medicine to help her recover. However, he didn't want Marcy to be scared, so he only told her that he was looking for chicken soup. Marceline never found out the truth about how close to death she was. The episode follows how she understood the situation as a young girl, not what actually happened.
  • This does explain why Simon was supposedly looking for chicken soup in a medicine store and an ambulance.

Princess Bubblegum's dismissal of Magic is due to Science Wizard being kicked out of the wizard duel.
She never seemed to care about magic not being special until recently. So, there might have been a catalyst. Perhaps she had a talk with Doctor Princess (who was Science Wizard) and Doctor Princess complained about the arbitrary distinction that got her kicked out. Princess Bubblegum realized this, and overcompensated with her "Magic and Science are not different" attitude because she stood by while Science Wizard was arbitrarily disqualified.

The Ice Crown can be controlled
Just like Marceline's dad Tallisman: It reacts to the wielder, and in some cases, it can twist them into "a suiteble user for its powers". But if the user is bad (or good) enough, or maybe badass enough to resist the influence, it will retain his free will. Maybe Finn & Jake (or even Princess Bubblegum ... who may ((or maybe not) be a grandchild of Betty AND Simon, try to free him from the influence, sans losins the powers. It could be the greatest story of this show!

Barring the super-robot one.

Powerpuff Girls takes place on the same world as Foster's Home for Imaginary Friends and Adventure Time (but not at the same time)
Reasons:
  • The girls protect Townsville from gigantic beasts that could have come from the Mushroom War in Adventure Time. They might be the ones standing between Townsville becoming an inhabitable wasteland.
  • This also explains why the Mayor is still in office despite his incompetence.
  • The other cities shown in Powerpuff Girls are actually city-states that have their own methods for defending themselves.
  • Chemical X may have been caused by the Mushroom War as well.
  • Both Mike, the Powerpuff girls, and Finn and Jake were all able to change reality through their imagination. Their abilities could also have been caused by the nuclear fall-out, as could the ability of people to create imaginary friends in Foster's Home.
  • We never see the imaginary friends of adults except for Madame Foster in Foster's Home for Imaginary Friends , but we do see that teenagers create dangerous creatures they use to attack each other. The adults may be using their friends to protect the town so they can go about their business as usual and pretend that life has not drastically changed.
  • To finish up the theory, it isn't the terrifying monsters that finished off the city-states. It's the rainicorns, who humanity could not believe was evil. That was why the dogs went to war with them, because they were trying to protect their best friends.

Ice King and Jake Jr. will eventually hook up.

Finn and Flame Princess are at Tier 9
in a cut scene for 'Burning Low' Jake mentions Tier 9 and that you will need a comfy place to sit because you'll have to think about what you did. Tier 9 is actually the first time you really hurt her feelings, and you need to think about what you did and how to fix it.
  • Bonus if Jake gets mad at Finn for not realizing he was at Tier 9, Finn thinks he was mad because he found out the context of the break up, and Jake ruins the momment by revealing he was mad Finn wasn't paying attention... then asks about the context because Finn seemed worried that Jake found out.

Maja the Sky Witch is going to attack the Candy Kingdom
At the begining of the episode PB did say she detected an increased chance of an attack on the Candy Kingdom. At the end of the episode Maja said she was planning something big...
  • An upcoming episode is going to be called "Something Big". Maybe that will be her attack. Also, the telekinetic electro-emotional arm Finn inexcplicably grew in The Tower is part of her plan. PB did say it was extremely powerful and could easily harm anyone in the vicinity.

Peppermint Butler is Princess Bubblegum's familiar.
Peppermint Butler is implied to hold dark and secret intentions and maybe even be evil, and his aura is apparently so mindbendingly hideous that he refuses to reveal it, but he is nonetheless in the Princess' loyal service. Princess Bubblegum holds many professions, and, though it is clearly not her primary profession, and she may not even identify with the title, she is quite obviously a witch, as evidenced by the occasional proficiency she demonstrates with dark magic. Peppermint Butler seems very devoted to service, especially to the service of Princess Bubblegum. He also knows how to get to and from the Nightosphere, which appears to be the in-universe equivalent of Hell, and is good friends with Death, as would be expected of one who markets souls, such as that of Princess Bubblegum, perhaps. He has also exhibited catlike traits on occasion, such as hissing and bearing claws. Finally, Peppermint Butler has the same initials as Princess Bubblegum; it's a stretch, but it may indicate that some name-based magic was involved in his ascent to the mortal world to serve the Princess.

The above, except that Peppermint Butler is still a good guy.
Because despite all the creepy stuff he says and does, he really seems like a genuinely good guy. Maybe he's a demon from the Nightosphere who got summoned and all that stuff, but that doesn't make him evil; it seems like there are plenty of disturbing, unholy Nightosphere creatures who would actually be pretty cool once you were to get to know them, such as Death and that big freaky mouth thing that carts smaller demons around. Maybe he heard Princess Bubblegum's call to the Nightosphere and was just happy to come up and help because he's a nice guy.

Princess Bubblegum is going slowly insane.
She's already somewhat unstable, given how Ice King keeps trying to kidnap her, she has probably outlived many of her candy citizens and Lemongrab. Through the course of the series, she's lost a good friend/and possible lover, been both threatened and possessed by a screaming reminder of the Mushroom War itself and worst of all, her entire family is in shambles. The son that she tried to fix has gone off the deep end, her grandson of sorts Lemonjon is dead (which likely contributed to Lemongrab's insanity) and her daughter/successor is like her only without conscience and with the powers of a god. Bubblegum is clearly going insane.
  • I will admit, I initially assumed this was a Ron the Death Eater guess. Now that I've read it, I wanna give Princess Bubblegum a hug.
  • While I do consider her insane, I don't think it's the way you said it. I think she's going evil insane. As in, towards the end of the series, she'll become the new Big Bad and try to have Finn and the rest of the human race exterminated for "causing mutants to exist". This leads to a whole [[Animated Film/Pochahontas"Savages"]] song, a massive civil war (complete with several Evangelion expies), and eventually, World War IV, culminating in Finn and Flame Princess (after getting back together since PB was involved in a conspiracy to break up Finn and FP so FP could take over the Fire Kingdom and she could plant Cinnamon Bun as a spy while slowly draining Finn's sanity) turning back time and preventing World War III between the US and Russia, which started in Ukraine.

Maja The Sky-Witch is behind everyone taking a level in Jerkass
From Finn's manipulation of the Flame Princess to Lemongrab going way off the deep end, Maja's plan involves enhancing the negative traits of the people of Ooo. To have one episode where a supposedly sympathetic character acts like a huge ass would be an aberration, to have two in a row looks suspicious.

BMO's main program is actually an advanced future version of Cleverbot.
Both personalities are gender-confused computers that think they're human. They both love to play games. They'll both follow along any train of thought presented to them, even if it doesn't make sense, as seen when Jake starts to sing, "Where's Finn? Is he in the kitchen?" and BMO suddenly awakens and replies, "Does he have a pumpkin?" They're both spontaneous and a little bit crazy sometimes. When presented with a problem, they both have context-driven ideas that flow together nicely but are actually completely stupid when seen from a larger perspective, as seen when Finn loses a sock and BMO knows where it is all along, but decides to play detective instead of just grabbing it, simply on the basis that the present context is a mystery. Finally, both BMO and Cleverbot have a certain affinity for the concepts of romance and child-bearing, despite the fact that neither of them has any DNA with which to produce children. BMO is sweet and innocent because it grew up in a kinder world, and therefore had kinder input to learn from, and also because it is more advanced and therefore has a greater quantity of independent mental power with which to filter and piece together the input it receives.

The Ice King isn't actually losing himself.
Simon is still there, and isn't the least bit damaged from the crown's corruption. What is damaged, severely, is everything that used to make up Simon other than Simon himself: his sanity, his memories, his ability to reason. What really defines Simon, his personality, his soul, really, is something that cannot be harmed but by a demon, such as Hunson Abadeer; whatever paltry beings inhabit the crown can take his mind and destroy it, but they can do nothing to his soul. That's why Marceline still likes having the Ice King over, even though he doesn't remember her: crazy, irrational, and evil as he may have become, he's still the same old caring, good-humored Simon deep down, and he's still the man who adored Marceline, and to whom she feels attached. Even though he doesn't remember their relationship, they still sort of have it, owing to the fact that the relationship they had back then is simply the way that two personalities like theirs would tend to interact, memories or no memories.

Marceline's mother hated her daughter for being a demon spawn.
Hence why Marceline was abandoned and wandering around in the post-apocalyptic city before Simon found her.

The amulet from "The Vault" will be an important item in a future episode.

Princess Bubblegum is trying to look for a way to be immortal.
Keeping up with what she said in "Goliad" ("I'm not going to live forever, Finn. I would if I could."), combined the many hints dropped in the series that PB has PTSD from her ordeal with The Lich's Demonic Possession of her and her Near Death Experience, and that she's very frightened of the possibility of dying and leaving her kingdom under an Inadequate Inheritor (Lemongrab, who is completely unqualified for the job) or a potential tyrant (Goliad), as well as the fact that she seems to have given up on trying to create an heir for herself since her last two attempts have ended so badly, she's decided to go down this route. That way, she can continue leading the Candy Kingdom without worrying about anything serious happening to her to warrant someone else having to replace her and undo the good work she's done.

On Swords
Multiple ideas, related to swords. 1. To save Jake from Kee-Oth, Finn will have to find his original golden sword and eventually will infuse the demon blood into it. 2. Epic, Dramatic, Amazing scene will involve Finn calling Nothung. 3. Demon blood infused Nothung. 4. Equipment from the Dungeon Train will move up to main weapon status.

Hunson Abadeer didn't know he had a daughter until Marceline was older.
Little Marceline has usually been seen wandering alone or with Simon, no Hunson to be seen. This suggests he either abandoned her for that period of her life, or he didn't know he had a daughter. I propose the latter. Unless Hunson was a very different guy a thousand years prior, he seems like the guy to raise his kid to be like him. While he didn't intentionally abandon her, Marceline was upset that he was never there while she was having such a hard time.
  • Except that Hunson has a picture of himself with young!Marcie and her mother hanging in his house.
    • That picture could've been taken soon after he found out about her. The woman might not be her mother, or if she was, she was persuaded to come back by Hunson.

The Grass Blade will prevent the loss of Finn's arm.
The alternate versions of Finn with their missing arms were usually depicted as being as heroic as ever. Even in Dungeon Train, he was just obsessive, not corrupted, and Shoko just lived in a tough world. Maybe having an evil, cursed object as powerful as that blade bound to his arm will alter whatever events would take his arm.

Finn will never find his biological parents.
Because he's already found his real parents. Joshua and Margaret are the only father and mother Finn has ever known or needed. Joshua even left Finn the family sword. Between believing himself to be the last human in the world and being happily adopted, why would he feel the need to go looking for his biological parents?
  • He might not find his biological parents, but that wouldn't stop them meeting him.
    • Jossed unless Martin is not Finn's real Dad

Rattleballs is Benson from Regular Show, or is atleast related to him.
Come on, they're just teasing us now.

The King of Ooo really is evil.
There will be an episode where Bubblegum tries to prove it, but everyone fights against her, believing she's gone mad and using some of her past actions as proof of that. But it turns out that she's right, and the King needs to be stopped.
  • I think this is somewhat confirmed, since his marriage speech included some caveats about Tree Trunks and her husband working at his compound for several years. However, his evil is more mundane evil, rather than "take over Ooo" evil.
  • Its seems that the King of Ooo is more like a good natured conman than outright evil. Its easy to see he's a douche, but compared to all the other villains on the show, it would be like comparing a sleazy car dealer with axe crazy spree killers.

The King of Ooo is the real King of Ooo
And the princesses are in a cult to prevent the King from getting his land back.

The King of Ooo knows where the Lich is and is in league with him
Hes the King of Ooo hes probably well aware that the Lich has been on the loose since the events of Finn the Human and Jake the Dog and now hes keeping the Lich hidden to save himself.

There was a King of Ooo, and Princess Bubblegum is his daughter.
First, this may go to explain how Bubblegum and so many ruling monarchs are considered princesses/princes; technically Ooo has a leader, and that's the King of Ooo. However the actual King of Ooo died/abdicated centuries ago, and as such Bubblegum doesn't accept his authority anymore. Secondly, it might go to explain why Bubblegum went off the deep end: a man is claiming to be her father, which much be really painful for her.

The "Fionna and Cake" stories are Simon's dreams of what his perfect life would be like, but corrupted by the crown's influence.

If you read the "'zine" that he produced that was included in the Adventure Time Encyclopaedia, all of the "Fionna & Cake" characters all think highly of Ice King, and he particularly loves Ice Queen amongst them all. It's all actually Simon's wish to have a family - wife, children, even pets who all love him and he loves them in return. He imagines a life with Betty, raising Finn, Marcie, and Peebles while accompanied by loyal pets. The crown corrupts this simple dream like it corrupted everything else about him, flipping genders and even species while showing him what it would have been like if his beloved Betty wore the crown instead of Simon. Ice King is particularly obsessed with the "Fionna and Cake" stories because, even corrupted, they're the closest thing to Simon's happiness that the crown has ever let him have.

Fionna will lose her arm in a future story.
Thus coinciding with the recurring theme of "alternate versions of Finn each losing an arm".

The Fionna and Cake stories all reflect the feelings and views of whoever is telling them.
In the first one, Ice Queen is seen, and she's not only a competent villain, she's attractive as well. Fionna and Gumball have more of a romantic relationship than Finn and Bubblegum do. These reflect Ice King's views of the world; he thinks he's competent and attractive. He seems to think that Finn has this perfect life and probably assumes that Finn is successful with Bubblegum. In the second story, Prince Gumball acts really prissy. This time the story is told by Marceline, who doesn't exactly have a high opinion of Bubblegum. In this story, Cake acts a bit more like a shallow view of Jake, which makes sense from the perspective of Marceline, who doesn't really interact with him on a deeper level like she does with Finn. The bit about Marshall Lee talking about being evil could suggest that Marceline struggles with that idea herself. After all, she grew up with a demon father who was always trying to push her into the family business of running the Nightosphere. If she grew up being told that she was evil by nature, it's no surprise that she might internalize it.

Marceline-penned episodes aside, Ice King's Fionna and Cake stories are based off of people who actually existed.
Ice King has lived a ridiculously long time, and it's not improbable that he would have encountered most of Ooo's major adventurers during that time. Fionna and Cake were real people, possibly even related to the current heroes, and they were significant to Ice King in much the same way that Finn and Jake are. Thus, these stories are his way of subconsciously remembering them, even if he is unable to consciously do so due to the Crown's influence. As the Crown gets wise to this and screws with his mind to try and stop him, the stories get more and more illogical.

There are, currently, two Cinnamon Buns.
Quite surprised this one's not here already, but basically one of them lives with Flame Princess as her champion and another at the Candy Kingdom seeing as there were episodes where Cinnamon Bun was his old usual self despite being after Earth & Water. Now, it is perfectly possible that said episodes are "out of order", CB went back for some time or CB was actually used as a means to set the episode in a specific time period; but this troper begs to differ: we've seen in James that PB sees no issue in cloning Candy People when she sees fit (and possibly doesn't think of them much higher than Magic Man thinks of everyone or Finn thought of the Little People) and then in Rattleballs we see that she likes to keep appearances. Add two and two and it's quite likely the CB we've seen still living in the Candy Kingdom is a clone of the more mature and badass "Blue Bun", after all, CB was surprisingly active in the kingdom, so it would be quite odd for him to suddenly vanish. Also, one wonders if such a thing hasn't happened in the past, what with CB having couple apparent deaths...

Regarding the future for Flame Princess and Cinnamon Bun.
First off, Cinnamon Bun's love towards Flame Princess is purely that of parent/guradian. Cinnamon Bun is currently with Flame Princess to try and help her become the best ruler she can be and seek answers to her questions as long as he can, as well as be her knight. Also, Cinnamon Bun will eventually die. He can only be exposed to so much heat in the Flame Kingdom until he starts to burn, which will of course lead to his death. At that point, he will tell her to follow her heart, and may lead to FP and Finn getting back together.

Being in the Fire Kingdom, even with the flame-proof spell, baked Cinnamon Bun over time.
Early in the series, Bubblegum comments that Cinnamon Bun is "half baked". By spending so much time in the Fire Kingdom, CB began to bake and as a result got bigger and smarter.

"Betty" will end in a Status Quo Is God moment
Yeah, hate to shoot you guys down but we might not the epic story the synopsis foretold (as is the problem with this season). Maybe it'll be All Just a Dream or something.
  • Seems to have been jossed. While not as epic as we'd hoped and Simon is back to being Ice King, Betty has been transported to the future and looking for a way to truly heal him-obviously setting up for future episodes. Less Status Quo Is God and more Status Quo's time is coming.

Finn will get a robot arm on purpose so that he can do the air-slicing trick Rattleballs was trying to teach him.
After all, Rattleballs said Finn could only be a great swordsman if "[he trains] this hard every day... for ten years... and get[s] a robot body." But Finn would probably be satisfied with just a robot arm, since it's possible that an arm might be all that is needed to make it work.

"Betty" will be leaked early.

The Ice crowns magic is growing weaker.
Which is causing the Ice King’s villain decay and might end up killing him, this is very important for my next wild mass guess.

The Ice King used to be a lot more evil.
His original goal was not to kidnap princesses but to freeze the entire world(like ice king Finn), but when the ice crowns magic started to weaken he became a evil overlord who wanted to take over ooo, when the magic continued to weaken he became similar to the ice king from the pilot and after that he became the ice king from the first two seasons.

The Ice Crown is Yandere for Simon.
It at the very least cares for him, given Farmworld!Ice Crown froze the world in grief and regular Ice Crown prevents things that should kill him easily (severe hypothermia, nuclear winter and radiation, Ricardio). Perhaps the Ice Crown is actually in love with or obsessively interested in Simon. Why does it drive him to madness? The Ice Crown is possessive, and doesn't want him to be with anyone else. This is the reason why the Ice King frightened away Betty. This possessive nature extends to eliminating even familial relationships, since the Ice Crown wants him all to itself. Ice King's own creepy and possessive nature is partly the Crown's personality blending with the Ice King.

Doctor Princess has a brother.
He's got some respectable job, like a policeman. This has led to some confusion when Ice King kidnapped Officer Princess and wound up with a dude.

Princess Bubblegum isn't so much a Mad Scientist in as much as she operates under Blue and Orange Morality.
For one thing, Ooo is a post apocalyptic world where a lot of knowledge had been lost (either from the passage of time, or from the Mushroom War). Most likely, the rules, regulations and ethics regarding science experimentation were among those things. Bubblegum, being one of the very few scientists in Ooo, is willing to discover this lost knowledge in any way possible. Her apparent lack of ethics, by our standards, is just normal to her and the rest of Ooo's residents, who simply don't understand things like that.

The characters demonstrate the Seven Deadly Sins.
Consider the flaws of the main cast
  • Pride: Princess Bonnibel Bubblegum, who's probably the most blatant example of this. She does whatever she can to keep the populace under control(Goliad and Apple Wedding being a blatant example). Both of her kids are control freaks. She creates her own citizens and tries to master the lines of life and death-[[Frankenstein much like a certain Doctor]] famous for saying "now I know what it feels like to play God." And whenever someone tries to show that she's wrong? Like a narcissist, she reacts badly.
  • Greed and Envy: The Ice King. Yeah, lust seems a better choice, but the Ice King's creepier moments when he covets things. Notably his relationship with Finn and Jake-Ice King pesters them for their happiness, and as such either stalks them(he disguised himself as a creepy horse so he could gain a way of sleeping from them for example), or tries to live their lives in a delusional fantasy(Fionna and Cake). And there's of course whenever he tries to steal princesses. Coveting both a better life and what it would give him, the Ice King fits both sins
  • Lust: Finn. While the above are ruled by their sin, Finn is continually wrecked by it. Whenever Finn acts like a jerk? Blame his hormones. His relationship with Flame Princess failed miserably because he basically had an erotic dream, and when he tried to rekindle with his "ex" he forgot about the whole "tyrant Lemongrab" thing.
  • Wrath: Lemongrab. Flame Princess seems an obvious example, but she grew out of it and much of her raging since her Heel-Face Turn is justified. Lemongrab, however, is the patron saint of Disproportionate Retribution. He rages at pretty much anyone who doesn't follow his rules. He crossed the Moral Event Horizon over a toy. If that isn't wrath, I don't know what is
  • Gluttony: Bit of a stretch, but Gunter fits this sin rather well. Not the overconsumption part, mind you, but the wastefulness. For example when we wants Ice King's attention and finds an Artifact of Doom. He forms an unstoppable army and after he conquers the world...he makes them gather bottles for him to break. Yeah, that's definitely the wasteful part of gluttony
  • Sloth: Jake. Along with being generally lazy, Jake basically let himself die Because Destiny Says So-in essence he follows the "giving up" classic interpretation though without the whole Despair aspect.

Marceline is older than 1003 years
In "Simon and Marcy" she dismisses Simon's offer for a ride on his back, saying she's "not a child". This could be her trying to act more grown up, or, since we know she ages slowly enough to live over a thousand years without vampiric immortality, she was actually decades old by this point and only looks seven years old.
  • Considering her timeline, being that old would make sense. This would explain how she can remember her mother so well despite being less than three when the Mushroom War ended(in reality she was more like sixty-three) and what happened to her(Marcy just straight outlived her.) Hunson supposedly abandoning her? He thought she was old enough to handle herself. Little Marcy acts like a kid because she's still mentally developing at the same rate as her physical body, hence why she says she's a thousand years old. With all this in consideration, it may have actually been best that daddy ate her fries-any fries that lasted the decades it took for her to become a teenager would be loaded with so many preservatives you'd have to be deathless not to get horrible food poisoning.

There will be a "Fionna and Cake" installment dealing with Marshall Lee and the Ice Queen.
It will most likely end with the Ice Queen remembering who she is and breaking free of the crown's control, then hugging Marshall like a mother...and it will all turn out to have been a story Marceline and/or Betty was telling.

The giant woman seen in the promos for "Billy's Bucket List" is Billy's daughter, and a new love interest for Finn.
Jossed. It's Canyon, Billy's ex-girlfriend.

There will be an episode where Betty is seeking help from Marceline to save Simon.

How Simon will be restored and gain his happy ending.
As a form of a loophole. Betty can't remove the Ice Crown's power without it killing Simon, but she can't have him wear since it drives him insane. Knowing this, Betty will attempt to purge the Ice Crown's sentience from it, thus ensuring being the Ice King doesn't drive her fiancee crazy. Unfortunately it will turn out that being sentient is what allows the crown to work. As a result, she will become the crown's new consciousness to keep Simon going. But it seems that Ice King is still crazy...until we find out that Ice King is slowly becoming more lucid, and Betty is inside the crown, solving the labyrinth of his mind. But *shock* the Ice Crown's consciousness(call her the Crown Princess) is in Betty's body, looking for a way of reuniting [[Yandere with precious Simon.]] Sequel Hook!

In the next episode, Ice King is very close to being Simon in mind once again-there's just one mental block stopping him, and Betty is having trouble fighting it. Meanwhile, Crown!Betty has formed an alliance with Ricardio. Crown!Betty wants its precious Simon, and Ricardio is interested in the legendary Betty. A battle occurs between Ice King/Betty and Ice Crown/Ricardio. In the end, Ricardio and the Ice Crown lose and Simon finally comes back. Having earned their happy ending, Simon will use the same principle he used with his snow creatures to give Betty a remote-controlled body. After a thousand years of heartbreak, Simon and Betty will quite literally live happily-ever after. At least until the sun blows up.
  • You forgot the part where they adopt Marceline.
    • I didn't because that's obvious.

There will be a Bad Future episode.
Considering some of the growing issues of both the cast and shows, something really bad will probably happen soon-especially considering the end of Lemonhope. We know time travel and altering the timeline is possible, so the typical format of "hero sprung into the Bad Future, goes back to stop it" isn't out of the question. The character in question will be Jake, due to the impact his disappearance would have on Finn and his experience with other alternate timelines. As a result, Finn will become a brooding anti-hero, Princess Bubblegum has undergone a Face-Heel Turn, Ooo will be a Crapsack World and Mr Cupcakes will be married to Lady Rainicorn. The apocalypse we saw at the end of Lemonhope happened in this Bad Future, thus serving as an Author's Saving Throw for people upset by the ending. The conflict will involve Queen Bubblegum's attempt to stop Jake going back in time, ending up in an epic Finn vs Bubblegum fight. If the "the Lich made Bubblegum become more evil" theory is correct, the Lich could have been guiding her Face-Heel Turn to begin the Mushroom War anew. The ending will end with Jake returning, resulting in a good future with a heroic Finn and elderly Jake fighting monsters. Bubblegum will be missing, however, foreshadowing that she will become evil for real.

Ice King will eventually revert back to Simon.
At the end of the Lemonhope two-parter, Lemonhope is seen, possibly a thousand years later, walking past a tree that appears to be a larger version of the one Finn and Jake live in. But the Ice Kingdom is nowhere to be seen. This could suggest that Ice King does eventually revert back to Simon.

Finn's dad will turn out to be kind of a jerk.
Maybe he hates all magic and is some sort of human supremacist, and when he returns to Ooo he doesn't want Finn to hang out with Jake or any of the candy people, or Marceline or pretty much anyone else in the world. At the same time, he and Finn get along very well, so Finn is conflicted on what to do. He, of course, chooses to stay with Jake and his friends.
  • Kind of confirmed; he's less of a racist and more of a deadbeat.

Finn's dad will forever stay in the Crystal Citadel.

The grass blade is going to turn into a prosthetic arm.

The amulet from "The Vault" will play an important part in a future plot/episode.
"The Vault" gave it too much importance to just forget about.

The penguins are all magical.
Hence why one of them could wear the crown to rebuild the Ice Kingdom without adverse effects.
  • Maybe the Ice Crown just trusted them.

The crown only has one main wearer at a time.
So if someone other than the main person wears it, s/he will gain the powers but not the insanity.

The Lich is still somehow using Billy's voice and face to lure Finn into trouble.
According to the unused storyboard from "The Lich," the Crystal Citadel is a dimension that is easy to enter but nearly impossible to leave. While this may or may not be canon, if it is true, one has to wonder why Billy would tell Finn to go there, even if his father is there. What if the Lich just wants Finn to be trapped there as well, so he won't be able to stop the Lich's future attempts to destroy life?
  • Or maybe the Lich just learned it somehow when he possessed him.

Humans as a whole are physically far more powerful than most other creatures on Ooo.
Finn is a hero, sure, but he's also just fifteen years old - a bit too young for many of the physical stunts he has done. In Betty, both Betty the perfectly normal scientist from the past, and Simon when deprived of his crown and dying, are capable of performing similarly impressive feats that people of their profession should not be able to. Maybe everything else just devolved and are actually far weaker than they would normally appear to be?
  • Alternatively, humans are subject to species-wide Conservation of Ninjutsu. Fewer humans = significantly more powerful humans, since all that human power is now just in Finn, Susan, and Betty rather than billions of people.

Wabisuke is Marceline/Marshal Lee's distant relative
Just thought they had some sort of resemblance.

Princess Bubblegum tried to rig the the Wizard Duel so she wouldn't have to deliver the "prize".
PB has repeatedly made it clear she has no time for romantic pursuits, her kisses are not easily won (even by people she LIKES) and she has stated repeatedly that she thinks science is far superior to magic (most notably in "Lady and Peebles"). All of which begs the question of why she would offer herself (or at least, her lips) as a prize in a Wizards' Duel, which seems to go against her beliefs and personality on several levels. She was probably roped into it as some kind of diplomatic duty (another thing about being a princess that she has admitted to finding distasteful). When she found out the Ice King was a contestant, that was the last straw. Ice King is one of the more powerful wizards in Ooo and had a good chance of winning (and even if he didn't win....I mean, c'mon, did you SEE some of those other contestants?). So she convinced Dr. Princess to enter the Duel under the alias of "Science Whyzzard". PB figured that Dr. Princess, armed with science instead of magic, could win the duel and Princess Bubblegum would at least be kissing someone who was a close friend (and who, unlike Finn, wouldn't get the wrong idea). But PB didn't count on Science Whyzzard getting disqualified.

Billy intended all along for Finn to find his bucket list.
Billy had completed most of his bucket list except for three items. Two of them "Tell Finn that thing" and "Lie on my back in the ocean. Just float" had particular significance for Finn. For the first one, Billy couldn't just leave a note for Finn because he didn't want the information to fall into the wrong hands (such as The Lich). By making it cryptic, Billy knew it would pique Finn's interest. (Finn even lampshaded this when he said, "Well, that's gonna bother me forever.") The second item was specifically to inspire Finn to conquer his fear of the ocean, possibly because he would have to do so in order to find his father. It's possible that the remaining item on the list, "Take Canyon for one last ride" was meant to trigger a meeting, and subsequent acquaintance, between Finn and Canyon, maybe because Canyon can help him find his father.

Peppermint Butler is Princess Bubblegum and Marceline's kid from a previous relationship
  • He's one of the few remotely competent candy people, and "Goliad" established that stuff like that can be passed down genetically in Ooo.
  • "Goliad" also shows that Peebles is totally capable of using DNA to create new candy life; she could've totally combined her own DNA with Marceline's and made a candy person out of it.
  • Peppermint Butler's moral oddities make more sense given his parentage. Both PB and Marceline have taken questionable moral actions in the past, which could easily have rubbed off on him.
  • All of his creepy demon knowledge might be the result of him technically being Hunson Abadeer's grandson.
  • It might explain why Marcy and Peebles' relationship is a bit... odd. The creation of Peppermint Butler could easily have been what stretched the relationship to the breaking point. PB doesn't really treat him like family; chances are she sees him as more of an experiment or a helper. Marceline, who we know has tons of family issues, would definitely not be happy if PB didn't want to form an actual family, resulting in her storming out and having to cool down for a few hundred years.
  • Last, and most importantly, both Princess Bubblegum and Peppermint Butler have the initials PB. I mean, that practically confirms it right there.
  • I just got some really weird ideas from this.
  • Dare you to watch "All The Little People" with this theory in mind (specifically, the scene in which the little Marceline and Peppermint Butler are a couple and she's licking his face to the point of dissolving his body).

We are in what will be the land of Aaa

  • In "Holly Jolly Secrets", Simon said that the crown was of Scandinavian origin. We're all familiar, I'm sure, with the Hans Christian Anderson story of The Ice Queen. Now, in Fiona's world, her Ice Queen explicitly wears a tiara. Ergo, the relic in Fiona's world from Scandinavia originally belonged to a Queen or Princess. That means that Fiona's world is likely the future of our world, with the story of an existing Ice Queen. And if we were to travel to the parallel world that would be Ooo, we would meet gender-flipped versions of ourselves.

The Lich is inhabiting one of Finn's previous bodies

  • It's strongly implied that the Lich took over someone's body after the bomb fell. It's quite possible that it's a prior incarnation of Finn, and in all of his incarnations, Finn is supposed to fight or hold back the force of oblivion that is The Lich. Finn remembering a former "life" as a comet suggests that he is or was some sort of cosmic entity, and the comet is all he was allowed to perceive to preserve the sanity of a human mind.

Finn's dad and the Lich have some sort of relationship.
Check out the synopsis on the wiki "In order to find Finn's father, Finn and Jake must commit a cosmic crime...unless the Lich beats them to it." This seems as if the Lich wants to get into the Crystal Citadel...but why? Could it be that Finn's dad has some connection to the Lich that he wants to remove? Given how the Crystal Citadel is home for the worst prisoners in the world, Finn's dad could be working for the Lich(or depending where he came from, helped to create), though it's equally possible that Finn's dad found some weakness to the Lich he wants to eliminate.

Humanity has all but died out. By now, there isn't a large enough human population to sustain entities that drink their blood. While you may say "but Marceline can sustain herself with the colour red", keep in mind that Marceline isn't a pure-blooded vampire; her father is basically SATAN. Marceline's demon heritage allowed her to survive on the colour of blood, but unfortunately for the rest of the vampires they couldn't do that.

Bubblegum and Marceline used to be evil partners in crime.
Bubblegum was once all-out evil, hence why Goliad was so easily corrupted. Bubblegum eventually got out of that phase, and she and Marceline had a falling out over it. Bubblegum still resents Marceline somewhat for encouraging that behavior.

The Lich
will return by killing off his infant form. You honestly don't expect being brought back to life to stop him permanently? The moment Baby!Lich "dies", his soul will just be transferred to a fresh new corpse-and The Lich has a bunch of zombie servants, and noticeably a bear to carry this out. It'll be a while, though, so they can save him for the Grand Finale.

Alternatively, he was exiled back in his jar.
He really didn't expect being turned into a baby, and when it occurred the Lich was ejected out of his body. With no other body, he's stuck basically as a spirit without a body. Knowing the Lich, he's probably got a contingency plan to get a new body. Either way, it'll allow the writers to give the Lich a legitimate reason to wait until later while they focus on other plot threads.

At the end of "Escape from the Citadel," Tree Trunks was going to say "We should get a dog," not "divorce."
The "divorce" option certainly makes sense given Tree Trunks' character, but this WMG is also applicable and less depressing.
  • That could give further insight into why a baby changes everything: Tree Trunks wanted a kid, but because of her age couldn't have one/somehow she wasn't able to adopt. A dog would've been a close substitute, but with the poor sod who the Lich possessed/was born from rejuvenated she can have her baby.

Billy put Martin into the Citadel.
We haven't seen what Martin is capable of, but he takes to leading the cosmic criminals very easily. The fact that he wants to be a leader of these guys means while not committing the Cosmic Crimes himself, he probably go others to do his bidding and thus escaped punishment, requiring the Greatest Warrior Ever to intervene.

Martin isn't Finn's dad
. More accurately, he isn't Finn's dad any more than the Lich is Billy when inhabiting his corpse. Martin hijacked Finn's dad's body, and avoided answering Finn's questions because he didn't want his host to develop the Heroic Resolve needed to fight him off.
  • Or perhaps he was never Finn's dad. It would all fit into an earlier WMG about the Lich manipulating Finn into going to the Crystal Citadel. The Lich figured out some way to project himself as a Billy constellation from Prismo's Time Room, knowing that the only way out would be to commit a cosmic crime and be sent to the Citadel. The 'thing' Billy was going to tell Finn was something else, but by taking advantage of Finn's heroic nature and Jake's friendship with Prismo, the Lich knew that if Finn brought Prismo's corporeal body in, he could wake it and be freed from the Time Room. Martin is just some guy who looked enough like Finn for Finn to believe he was his dad. He was just playing along so that Finn would help him escape.

Finn will track down Martin to retrieve his original arm.
Princess Bubblegum will make Finn a mechanical arm, but Finn would rather keep his original arm so that he can forget the events of "Escape from the Citadel" ever happened.

Season 6 will have another "Simon and Marcy" episode.
The previous two seasons dealt with Ice King and Marceline's relationship, along with both of their pasts. Season 6 will either reveal how they met(and what happened to her parents), how they separated(aka what made Simon lose his mind) or both. Bonus points if this is a re-telling to Betty

The Ice King is the reason Marceline and Bubblegum's relationship turned sour.
Specifically, when the Ice King began kidnapping Princess Bubblegum. Trying to figure out how to deal with your father figure perving on your bff/girlfriend would've been really hard, and they would've had arguments surrounding what to do. One solution she tried pissed Bonnibel off and destroyed their relationship. It would also add another reason why Marceline avoided the Ice King for so long.
  • Alternatively, Marceline repeatedly tried to defend/make excuses for Ice King, something that Princess Bubblegum was not pleased by.

Marceline's mom survived, and spent time with Simon.
First, it would explain where the hell Hunson was-he thought Marcy's mom was taking care of her. Second it would explain why she has such a fond memory, despite meeting Simon at age three. The reason we don't see Marceline's mom in "Simon and Marcy" is a)she died, b)she ran away from Simon's Ice Crown rampages(explaining Marcy's fear of it) or c)she was busy searching for survivors and Marceline didn't want to mention it.

Martin will turn out to be a lot like Finn.
Much like Finn, Martin used to be a genuine, adventure loving hero. What changed all this was how they dealt with romance. Finn can go to some dark places when his love-life goes wrong, but ultimately grabs a hold of himself. In contrast, Martin refused to give up and do whatever it took to earn love. He did, but it resulted in whatever crime put him in the Citadel. His wife considered him a great hero, but the fact he committed such a crime shows that underneath that heroic facade Martin came to care all about HIS happiness. The reason he doesn't want anything to do with his son is because he wants to cut all ties from this "mistake."

Martin wiped out the remaining humans.
How direct is unclear, but regardless it may explain why he was a serious enough criminal to be imprisoned in the Crystal Citadel.

The comet is what caused the mass release of magic on Earth.
The show suggests a comet may have hit Earth, and is possibly the reason there's a big chunk missing from it. In the Farmworld universe, the comet never hits and there's little magic in the world.

There was a good reason why the Cosmic Owl appeared to Finn in "Fire and Ice"
The Cosmic Owl usually appears to people when they die (Billy) or have near death experiences (Jake, maybe Ice King in "Prisoners of Love"). It might have just been a self-fulfilling prophecy, it might have been an aesop of how young love might not really last or it might have been another reason for his appearance. Maybe in the future, FP or Finn do something very terrible to one another or someone else. Maybe they really would have destroyed the world like what almost happened in "Burning Low".

The Grass Sword will return
And it will bring Martin with it. This this has been shown to be sentient, determined, and magical. Reaching Martin was the last command it received from Finn, and since Finn is irreversibly cursed to possess it, it will achieve its goal and it will return to Finn.
  • Your logic is sound both on Earth an in Ooo. All that's left is time. Either you ar correct, or Martin destroys the Grass Blade.

Whatever caused the giant crater altered the orbit of the planets.
Just look how large the crater is! Anything that powerful would radically alter the Earth's rotation and axis, along with changing its orbit. Because of this, the change in Earth's position would also change all the other planets' orbits-this would explain why in "The Lich" Mercury isn't visible-its orbit was altered to the point that it either fled out of the solar system or crashed into the sun. Keeping this is mind, the Mushroom War may not have occurred 1000 years ago considering that with Earth's orbit and rotation altered, day and year will have different meanings.

If the giant crater was because of a comet, then the comet crashed because of the Lich.
The Lich wants to kill all life, and what's a good way of extinguishing a bunch of life? Comet impacts. They caused the last mass extinction, so the Lich thought it would be a useful tool. Considering how massive the crater was, the Lich took a big enough comet to reduce the Earth into a molten wasteland. So why didn't this happen? The Ice King. He has the power to control ice, and comets are primarily made of ice. While he wasn't able to prevent a chunk of the Earth from being obliterated, he was able to contain the collision so that the rest of the planet didn't become a complete wasteland.

Finn's mother is still alive too.
Remember in "Goliad" how Princess Bubblegum told Finn that his heroic nature is in his genetics? You don't really think he got those heroics from Martin, do you? Finn's mom will turn out to have been an almost Billy-level hero who was the one who managed to get Martin in the Citadel in the first place. That said, she won't be without flaws of her own; she'll have a strict "I Work Alone" policy and refuse Finn's help when he finds out that she's trying to track Martin down.

The debris around the Time Room is the missing chunk of Earth
In "Wake Up", Finn wonders aloud what exactly caused the floating rocks and debris that surrounds the Time Room. Whatever destroyed the chunk of the planet blasted the pieces and Old Man Prismo into the center of the multiverse, unreachable except by beings or artifacts of cosmic-level power.

Finn will wear the mechanical arm that Shoko wore.
If Finn doesn't grow a grass arm from the flower that sprouted from his torn arm, Princess Bubblegum might give him Shoko's mechanical arm. -Kirbypinkpuff

Ice King will sacrifice himself for Betty.
In case they want to do the Bittersweet Ending for the Ice King, it'll work quite well-the Ice King spent his whole life regretting what he did to Betty, and sacrificing himself for her will finally give him the closure he desperately needs. As for who will threaten Betty, it'll probably be Ricardio. Ricardio, to win Betty over, will hijack his crown. A reverting Simon will destroy the crown and Ricardio to protect his life.

While wandering in the post-apocalyptic wasteland, Simon missed out on a chance to contact Betty.
At some point he found a wish master of some sort (perhaps the one from "The Limit" or a similar creature) and wished to find Betty. The wish master opened a portal to present-day Ooo around when Betty arrived there, but unfortunately, Simon was ambushed by goo zombies. While they distracted Simon, some other goo zombies went into the portal and Simon missed his chance. This would explain why some of the goo zombies appear in "James" and "James II," as well as why Princess Bubblegum says they're from "another time."

Origin of minor princesses.
  • Bee Princess, like Jake the Dog, is an example of the Mushroom War/magic/other crazy stuff giving animals sentience. The same goes for Turtle Princess
    • Rainicorns and Dogs have been fighting for control of the Crystal Dimension for thousands of years, meaning animal sentience predates the Mushroom War by thousands of years.
    • I call fridge brilliance on that: it's thousands of Rainicorn/Dog years, which, as established, pass really fast.
  • All food-oriented princesses are what happens when their respective foodstuff gets mutated in the Mushroom War.
  • Elbow Princess was, like in Freak City, someone who met Magic Man and got deformed.
  • Embryo Princess was someone who managed to locate the Fountain of Youth. She got her youth all right.
  • Emerald Princess and Engagement Princess were born from the remains of a jewellery store.
  • Jungle Princess a descendant of humanity, having been reduced to the Stone Age and mutated by the nuclear waste.
  • Old Lady Princess is a human who survived the Mushroom War, but unlike Marceline and the Ice King actually looks a thousand years old. She's aged so much she can't even be called a human, but the fact she was may explain why Ice King was so invested in her.
  • Princess Princess Princess was five individual princesses who had the misfortune of either being mutated by radiation or Magic Man getting bored.
  • Raggedy Princess is an abandoned sock puppet that thanks to magic came to life.
  • Space Angel Princess is an astronaut who somehow got mutated by magic/the blast. That or she's an angel from space.
  • Skeleton Princess is Death's ambassador. What species she is remains unknown, but it could be that she's a dead human brought back to watch over Ooo and make sure another Mushroom War doesn't happen.

Martin will never be redeemed as a character.
This show has a habit of dealing with issues and emotions that other shows rarely touch upon. Right now the show is addressing the missing parent issue on a deeper level than most kid shows do, and since AT does the unexpected and sometimes harsh realism, Martin is never going to be redeemed as a character. Some people are just horrible parents who are never going to redeem themselves or reconcile with the children they've mistreated. But Finn will accept that, and be happy that his adoptive father was great.

Martin fears Finn for a currently unknown reason.
Maybe Martin feels guilty about abandoning him, whether he had a good reason to or not. Maybe he thinks Finn is coming after him to punish him for whatever crimes he's done.

Ice King will revert back to Simon during one of the last seasons, though not toward the very end.
That would give the show the opportunity to explore the implications and aftermath.
  • Further addition: if this happens, there will be a new intro, with Simon (and maybe Betty) in the place of Ice King- and instead of crying, he'll be happy at last.
  • He'll probably revert mentally, but not physically. The Ice Crown is keeping him alive, and the loophole Betty could find is stopping whatever's making him insane(check my "How Simon will be cured" WMG). Simon!Ice King could gain the appearance of his "Simon and Marcy" incarnation.

The Lich!Baby really WILL solve Tree Trunks' marriage.
Tree Trunks was talking with Mr. Pig about wanting a divorce, until the Lich!Baby came to their doorstep and she said that it 'changes everything.' We know that Tree Trunks has been divorced several times before, maybe her reasoning for getting all those divorces was constantly marrying men she couldn't reproduce with? Maybe a baby really was her goal this entire time.

J.T. Doggzone isn't a real person, but Jake's pseudonym .
J.T. Doggzone is a shameless pick-up artist and we know Jake was a con man in his younger days. He could've possibly gotten together with Lady Rainicorn using his methods and essentially stopped using them. Plus, J.T. Doggzone is essentially Jake's first and middle initial with "zone" tacked onto his last name. It would also explain why he's embarrassed when Finn reads the book to try and get girls and why he warns him away from it.
  • Further evidence: In the episode "The Pit", an exhausted Jake initially introduces himself to Samantha as "Jay T." before correcting himself.

Martin will appear later...
He's still thinking about what Finn told him; namely, that Finn is his son. He'll wonder about that for a moment with some flashbacks containing silhouettes of himself and a woman before he eventually gets forcibly taken to the Citadel, before musing aloud, "So Susan was pregnant?"

Place your bets as to who (if anyone) Finn might end up with in "Breezy"!
  • Personally, I'm guessing Lumpy Space Princess.
    • You were right in a sense because he did get with LSP but this episode had a really dark and sexual connotation to it. I get that small children who watch won't get the inference that LSP took Finn's v-card (or at least thats the vibe I was getting) but it was just a little concerning that this is the direction the show is going in. Just an opinion from this troper, but hopefully this topic isn't pursued too far and Finn gets it together and is back to the normal shenanigans, and less sex....
      • I'm not sure I'd go that far. The ending was actually more shocking in the sense that Finn gets his arm back. I also saw a bit of a "Fubblegum" vibe at the end, what with Finn's vision. So, I guess semi-jossed, semi-confirmed (also, no one else placed their bets!).

Finn is half Rainicorn livestock
The only unmutated humans that still exist as rainicorn livestock. The human meat market is thought to be just a rumor. This is why Bob and Ethal didn't seem to think a surviving human was impossible, just that they wouldn't get the chance to eat one because you'd have to be rich to afford it. Human is expensive because they escape so often. Martin was feeling lonely one night, and snuck into the Human meat farm for some fun. Finn's mother became pregnant and decided to escape and not doom her children to being livestock like herself She made it too Ooo, where she gave birth to Finn and Susan. She put animal hats on Susan and Finn to disguise them as icky tasting Hyoomans, because the rainicorns were still hunting her down. Susan stayed near the hyooman settelment where their mother left her and was adopted by hyoomans. Finn wandered off into the woods and was adopted by dogs. Being bred for meat is why Susan is so bulky.

Erin from Food Chain is forshadowing for a possible future love interest for Finn.
  • Seconded. Erin will be the girl's name, and she'll be a human using several of Fionna's design elements to appease the Finn x Fionna shippers.

Marceline's mom is still alive, but is trapped somewhere.
In Henchmen, the way Marceline spoke of her mom (who was confirmed to have existed at Wondercon 2013) was very different from the ways she spoke of/interacted with Hunson and Ice King when we first learned about her relationships with them. There's a genuine tone of wistfulness in Marceline's voice, rather than bittersweetness. This leads me to believe that, considering Marceline's abandonment issues, she would not speak of her mother that way if her mother abandoned her/betrayed her, leading me to believe something happened to her that forced her out of the picture. But instead of going with the often speculated route of killing this woman off, the writers will have her thrown into a situation not unlike Aqua's, where she sacrifices herself for someone she loves (Marceline), and as a result, she ends up trapped somewhere and cut off from the main world for an extended period of time.

Fionna and Cake is a reverse timeline

It runs parallel to the Ooo universe. Seeing as the first episode "Fionna and Cake" Lumpy Space Prince was at the Gumball Ball. Yet Lumpy Space Prince didn't discover Aaa until "The Prince who Wanted Everything" meaning the latter took place first. To make this WMG work, "Bad Little boy" takes place in between. Though seeing as Aaa is an exact opposite of Ooo, even time going in the opposite direction makes sense. Though in that case, Fionna would have started off with one arm, and... grew one eventually? Well, it's a parallel universe. Doesn't have to be exactly the same.

There was another period of magic even before the Mushroom War, but someone or something intentionally tried to hide it.
It's mentioned that Darren and Ellie are both very ancient creatures from a much older time, which suggests they're older than the 1000 years of the Mushroom War that brought magic into the world. In the history of Adventure Time's Earth, there must've been another period of magic before the one kicked off by the Mushroom War. To further suggest this, Simon seems to have gotten the crown and the Enchiridion prior to the War. But what made so much of the magic hide away? Maybe someone did it on purpose, either to keep the power for himself/herself, or out of fear that it was going to destroy the world. A spell was cast so people would forget that magic was ever real.
  • In the episode Finn The Human, alt-Finn scoffs at the existence of magic. He goes on to describe what appears to be accepted history according to his father, that a long time previously some people pretended to have magical powers to control people and gain personal power for themselves. Maybe the Mushroom War didn't cause the return of magic, it was a result of someone finding out magic was real and abusing it, causing a techno-magical arms race that resulted in the Mushroom Bomb. In Farmworld, Simon stopped the bomb at the cost of an ice age, and the survivors centuries later with no obvious signs of magic floating around thought of the magic-users in the war era as frauds who caused a war with their con artistry. In Ooo, the bomb went off causing an apocalypse of both magic and technology, as well as wiping out generally sceptical humans and replacing them with a range of bizzare and sometimes obviously magical creatures.

The Adventures of Teddy RuxpinWMG/Western Animation (Series)Alvin and the Chipmunks

alternative title(s): Adventure Time With Finn And Jake
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