Harry Potter canon that Merlin exists and that he was one of the most powerful wizards imaginable. Also in Harry Potter, a lot of the magic is ebbing in quality, which would make sense given the abscence of wands in Merlin. Some wizards in Harry Potter can perform wandless and/or wordless magic, but the wizard must be extrodinarily powerful, not many can. It would make sense if magical spell quality is decreasing that this ability is everywhere in magic users in Merlin. Wands don't even exist in the show, suggesting that they aren't needed and haven't been made. Merlin might have had something to do with the founding of Hogwarts, or at least influencing it's founders, as he himself has had a lonely childhood because he was the only one able to do magic in his village and had to keep it a secret. He feels for Morgana when it is revealed that she has magical powers for the same reason. It makes sense that he would want to help young people seperated from other magical users. This would mean that Merlin (and for that matter, Morganna) is, infact, muggle-born... an extremely interesting interpretation that many pure-blood families in Harry Potter would be outraged about. There are, also, pure-bloods in Merlin, the druids, for example, of which Mordred is a member. This era could very easily be the reason that there is hatred towards muggles, and by extension muggle-borns, in older pure blood families given Uther's hunting down of magic users.
Lancelot will be back at some pointLess a WMG, more a foregone conclusion.
There is Hammer Space cloning facility underneath the castle...how else do you explain the endless supply Red Shirt knights that keep popping up after getting slaughtered? I mean, there's an entirely new flock next episode. Surely Camelot is running out of noble sons by now.
Merlin is actually set in the futureThe characters are actually reincarnations of the legendary figures rather than the legendary figures themselves, hence there are parallels, but it's not quite the same. The world they are living in is a few centuries down the line from a devasting nuclear war, after which the survivors turned away from technology. That's why Gaius' medical knowledge seems too advanced, and why they have potatoes and tomatoes and sandwiches, and why all the other anachronisms. Also, at some point during the war a weapon was created that was powerful enough to punch a hole in the fabric of reality, letting in the magic (and the dragons, and so on) from the world of the Sidhe. This is why there are still portals, like the lake. There are also those strange and creepy monsters which are quite possibly genetic mutations.
That was not Igraine.The whole thing was just too damn convenient for Morgause. She clearly was trying to get Arthur to kill his father and couldn't have known Igraine well enough to know exactly what she'd say unless that was an illusion. If Igraine knew that Arthur was born of magic, then she must have known about the price; Uther and Nimueh would have told her. And if she didn't know that while she was pregnant, then how would she know after her death? Did they explain it to her while she was dying? And also... earlier in the episode, Arthur says his mother 'died before he opened his eyes', but Igraine contradicts this. Maybe Morgause didn't know all the details?
In Albion, time and space are relativeThat's why the show is is Anachronism Stew, and also why, for example, Merlin managed to catch up with Uther and Morgan in To Kill the King, even though he was on foot and they were on horseback. And other such things. Everyone is aware of this, but it's normal for them, so they just don't talk about it.
The Druids are time travelers.Or some form of it. Mordred was the child of Morgana and Arthur, and after some event caused her to turn evil, she sent him to study with the Druids. They sent him through time to meet Merlin for whatever reason (or perhaps meet the man he would one day kill). It would explain why there are texts written about him, and how Mordred appeared, and Morgana's strong connection with him.
The Dragon is Merlin's fatherHow many people seriously thought he was going to say 'I am your father' in "Le Morte D'Arthur"? Also, Hunith's comment about Merlin and Arthur being two sides of the same coin would imply that they've met... (Obviously, this is assuming that the dragon can shapeshift into a human).
Merlin's father is one of the SidheThis would explain both his talent for magic and the way he knew how to use the Sidhe staff straight away in The Gates of Avalon. Also, in The Gates of Avalon, Merlin has to slow down time to be able to see the Sidhe properly; but Aulfric seems to be at normal speed. Assuming that he, in human form, would have the same problem that Merlin did initially, he may also have slowed time to speak with them. This suggests that it's a Sidhe ability.
Merlin is The DoctorAccording to Doctor Who continuity, they're the same person.
Morgause is the daughter of Gorlois and Igraine or Uther and Gorlois' wife
Anhora wasn't lying about one of the goblets containing poisonOne of the goblets did contain poison, which could only be neutralized by the contents of the other goblet. Part of the Secret Test of Character was that Arthur had to be willing beyond a doubt to die for Merlin.
Morgana is lying about being sorry for her previous actions.In the season 3 trailer we see Morgana begging Uther to take her, saying that she's sorry about what's shes done. It could be a Wounded Gizelle Gambit to get close to Uther to kill him.
Gone, gone the form of manNow that Morgana is obviously evil we might get to see Merlin and her set up a few problems for each other. Perhaps one of these will revolve around a newly introduced young knight of Camelot with red hair called Jason Blood. Ok, it'll never happen, but it would be cool to see.
Morgana will be the one to seal Merlin awayThe series seems to be setting her up as Merlin's evil love interest which will cause them to have mixed feelings about being on opposite sides. She will pretend to go along with Merlin and Arthur, but will seduce and betray Merlin by learning his secrets and sealing him away into a tree with one of his own spells. The result will be that Merlin won't be at Arthur's side during the final battle and Mordred will successfully kill Arthur, leading to a Downer Ending for the series.
Morgana is dead.The poison actually did kill her. Morgause, not wanting to lose her sister, made a magical Deal with the Devil to bring her Back from the Dead. Only, this did not bring her back but in fact invited a malevolent spirit to inhabit her body. Morgause does not know this, and 'Morgana' is using her along with everyone else for some nefarious plan (besides the obvious of killing Merlin and Co.). This could explain how she became pure evil and with a desire for revenge so quickly. Nimueh, maybe?
Morgana will be forced to flee Camelot in the upcoming second part of The Tears of Uther Pendragon.There's absolutely no way she will be able to continue her masquerade after Merlin inevitably foils her and Morgause's plan. Everyone, including Uther, will know that she is a sorceress and how far she has fallen. Uther, being the complete Jerk Ass that he is, will probably remark that he should have known and killed her years ago. Arthur's feelings about magic will be set back yet again because of these events. She will escape with her sister from Camelot, and continue to be a menace in the future. More than likely she will show up for the finale as the Big Bad.
Arthur has already figured out that Merlin is a wizard.Of course he won't say anything, since he's now in on the secret. Not only has he been in the same room as Merlin using magic about a thousand times, he always seems a little too dismissive and even angry whenever Merlin is suspected of being a magic user. (See "The Mark of Nimueh" and "The Witchfinder.") Compare this to his resigned acceptance that someone like Gwen may have used magic to cure her father. Arthur is fully aware Merlin has saved his life on numerous occasions, which explains why he insists on Merlin being by his side for any dangerous journeys or battles, even though he's usually loath to put other people's lives at risk.
The series will end with a Kill 'em All, utter Bittersweet Ending / Downer Ending that will go against everything the legends say.Face it, this is a BBC series and already some things have been very subverted or outright changed from the original stories (some people have even already died who shouldn't have). Something like the following may happen: Arthur will find out about Merlin's magic (probably due to it having to be used in front of him to prevent his death) and will understand and help him due to all the good he has done, but he will be forced to flee from Camelot as Uther would probably quickly find out. After this, everything will immediately go downhill and the Big Bad Duumvirate of Mordred, Morgause and Morgana will attack Camelot in full force and without mercy. Merlin will rush back to find most of Camelot in ruins and nearly everyone slaughtered, including Gaius, Gwen and Uther. Morgana will hold a critically-wounded Arthur hostage and taunt Merlin, who will decide to take none of that crap and instantly kill Morgana with some spell before she can do anything else (since she is the most inexperienced of the three, she wouldn't be able to defend as well). Arthur will live long enough to say farewell to Merlin and for being a good and loyal friend, before dying. Merlin, in both anguish and rage, will find Mordred and Morgause and ruthlessly kill them both in an epic magic battle far beyond anything seen so far, which will exhaust most of his magic power. The Great Dragon will then appear, and instead of taunting or trying to attack Merlin will congratulate him on fulfilling his destiny, albeit much earlier and in a different way than he expected. Merlin will be outraged. The Dragon then explains that, with Uther dead and Camelot destroyed, and with the 'Great Three' magicians dead, magic will indeed return to the land but in a much different and less visible form (technology). Regular magic will diminish to the point where it will be gone forever. Also, with this accomplished, he reveals that his time in the world is up and tells Merlin that he will be the one to unite Albion and not Arthur. When Merlin complains that he said multiple times that Arthur was to be king, the Dragon laughs and says that prophecies can be interpreted many different ways, before flying away never to be seen again. Merlin then meets with Geoffrey of Monmouth, one of the few survivors of Camelot, and explains everything to him. They agree that Arthur is needed else Albion will fall into chaos, so Merlin uses a spell to permanently switch his appearance with Arthur's body (using the rest of his magic and forever losing the ability to use it in the process), meaning that Merlin was the one 'killed' by Morgana instead. Due to the 'miracle' of Arthur surviving, the survivors gather together and crown him their king. Eventually, Camelot is rebuilt bigger and better than before, and peace and prosperity reign throughout the land. Albion is indeed united. The ban on magic is lifted, but already magic is fading and very few people can do much with it. Lancelot, having not been present in Camelot, will return and become 'Arthur's' most loyal knight and friend. Besides Geoffrey, only Lancelot will know the truth about Merlin. Merlin, however, is still deeply saddened and bitter over where his destiny led. Geoffrey, in secret, chronicles the legend as he thinks it should have rightfully happened, making the legends of King Arthur we have a very early form of Fan Fic. Merlin lives to an old age, but never marries. His heir turns out to be an historical figure, who takes over the land and renames it, making Camelot fade into legend and myth. One night, he awakens and sees Freya in his room and realizes that he is younger and back in his own body, meaning he has died. As he is ready to leave with her he also sees Arthur, Gwen, Gaius and many others who stay silent but smile at him. Then the screen fades to white. And the fandom will cry.
Freya was deliberately invented to Ship Sink Merlin and Morgana.It didn't work, however. Every other attempt by the writers since then to do so hasn't either.
Episode 5 of Series 3 will be either a test, All Just a Dream, or a time-travel episode.According to the press release, Merlin will visit a wizard who shows him a vision of Morgana murdering Uther. Merlin will try to prevent this with 'fatal consequences', which means that he will probably confront Morgana. What could happen: She will try to kill him with magic but Arthur will come out of nowhere and be hit by it, dying instantly. As a result of this, everything will quickly go downhill. Morgana will blame Merlin for his death in front of everyone and accuse him of sorcery (also having bruised herself to look as if Merlin hurt her), and Uther will likely try to run Merlin through right then and there. With no way to defend himself he will use magic in front of him to escape, further proving Morgana's claims to Camelot. With Arthur and Merlin gone, Morgana will proceed to murder Uther in the very fashion that was predicted, and claim that Merlin came back and did it. With both Uther and Arthur dead, she will be crowned as Queen and lift the ban on magic. Her reign would be far from ideal though, instead being as much of a tyrant as Uther if not more so, and the land would suffer. Merlin, having failed his destiny and having nowhere else to go (the Dragon, if he appears at all, would reject him), will turn himself in to be put to death, completely and utterly broken. Morgana and possibly Morgause will torture him to near the point of death, and one of the following things would later happen: a) Merlin will end up back in the cave with the wizard, with it being revealed to him that it was all a test, and to warn him what will happen if he should fail. b) Merlin will wake up in his bed, all of it having been a nightmare. He tells Gaius, and he tells Merlin that the wizard (Taliesin) died a long time ago and that he must have been reading about him. Merlin will reveal that he never heard of him before, meaning that he was in fact sort-of Dreaming of Things to Come, warning him what will happen if he should fail. c) Gaius, or someone else, will sneak in and give Merlin a magic trinket to go back in time. The cost is that the person will soon die after using it, as it is powered by life force. Merlin will change his appearance with magic, use the device, and run across his past self before he confronts Morgana. He will warn him not to do what he is planning, and then die.
Uther will be Killed Off for Real by Morgana, having usurped the throne of Camelot for herself and forcing Merlin, Arthur, Gwen and others on the run for their lives.Promotional pictures and videos for later Series 3 episodes heavily suggest this may indeed happen. Most of Camelot probably hate Uther like no other and will rally support behind her, and those who don't will be executed or forced to flee. Morgana, wearing the crown, in shown to be ordering an execution. This is probably Uther Pendragon, being killed in one of the same ways he had done to many others, as an act of revenge and irony. Gwaine, Lancelot, Leon and some other unnamed knights are shown to be loyalists to Arthur, and likely will become the first of the Knights Of The Round Table. The later episodes of Series 3 will be one Wham Episode after another, with large heaping doses of Nothing Is the Same Anymore, and Status Quo Is God being lifted once and for all. Merlin's magic will be revealed to everyone, Uther will die at Morgana's hand with Merlin helpless or too far away to prevent it, and the last episode will end with Morgana being defeated and driven away from Camelot, since she must survive in order to later align with Mordred. Morgause has no such prophecy protecting her and may well die, probably right in front of Morgana at Merlin's hand, which will cement her rage and hatred for him forever. Arthur will be crowned King and Gwen his Queen, and all will be well in Camelot for the time being. Doesn't that sound like a Grand Finale, if it ends up being true? Perhaps Series 3 of Merlin is going to be the last, or for whatever reason the writers are deciding to change the show for good.
Morgause has Confessed Morgana.Or some corresponding form of mind-control magic. Perhaps the blood link helps. In any case, since Morgana has returned, she has demonstrated absolutely no qualms about killing off her former friends. In "The Castle of Fyrien", she was willing to let both Gwen and Arthur die. Wanting to kill Uther or Merlin would be understandable. Perhaps Morgause could even have convinced her that Arthur's apathy allows his father to continue his tyranny. But in "Lancelot and Guinevere", Morgana is terrified for Gwen's well-being, indicating that she is a very close friend. How would she or Morgause justify to herself that killing Gwen is acceptable? Another indication is her lack of concern for the well-being of Camelot's citizens. When she kills a guard who spots her leaving, it almost seems like she is relishing it. In short, her actions have become Card Carryingly Villainous, which is completely out of character for her. Perhaps, then, she is quite literally out of character? Perhaps Morgause has enslaved her will? It's not implausible that she does have that (or similar) magic, since if she did, it could take a year to cast on someone, which is why it's taken so long to get Morgana back into Camelot - she was Confessing her the whole time. Then there would be a simple explanation as to why she doesn't just throw it around, using it on everyone. So Morgause sends the mind-enslaved Morgana, who now wants only to please her mistress back into Camelot with orders to act normal until she's needed. And to smirk about this situation EVERY SECOND THAT NOBODY'S LOOKING.
Morgana was not meant to be evil, and may return to goodThe Dragon wanted to destroy Camelot. But what was in his way? Well, Morgana could not only predict his actions (a general's wet dream), but tell Merlin he was the Dragonlord. So the Dragon ordered Merlin to betray her. After years of Uthur's treatment, Morgana is half a step away from C-PTSD (PTSD resulting from multiple traumas instead of just one). When Merlin betrays her, it's the straw breaking the camel's back, and Morgana has a psychotic break. Morgause, seeing this, brainwashes Morgana into being a Card-Carrying Villain. However, there is a flip side to this. Because Morgana is reacting to trauma, Arthur should, in theory, be able to reverse it—if he could confront her, she could become good again. And if this happened, Camelot could completely change...
Princess Elena is the Elaine that Lancelot marries in the mythHow adorable would it be if he married her?
Uther has an alcohol abuse problem.Go back and watch through all the times Uther has an outburst of rage. Now, what was he doing just before? Have there ever been any times Uther did something...Moral Event Horizon-ey without having had a goblet in his hand a moment before? And the decisions where he didn't he's never shown any signs of regreting, as opposed to the ones where he did. Also, what is Uther most often seen doing when Camelot is in crisis?
"Dragoon" will become Merlin's sorcerer alter-egoSince Merlin is based off of Smallville, future episodes may have more of Clark Kenting twist involving Merlin. Dragoon is already notorious as a twisted sorcerer, so Merlin has a persona to do the dirty work that he would normally get in trouble for doing. It would also parallel nicely with the legends surrounding the legendary Merlin who could switch from a young boy to an old man.
Merlin will someday learn to shapeshift into animalsIn the original myths, Merlin does in fact fight a duel through shapeshifting (That duel with Mim wasn't just a Disney thing). Also, Merlin's name is that of a bird of prey, and I can't be the only one who would love to see him turn into a bird because of that.
Lancelot will become Galahad's Big Brother MentorObviously Galahad will have to come in sometime soon to join the knights since he's such an iconic part of the original myth, but he can't possibly be Lancelot's son. It would be sly way to reference the fact that Galahad in the original Arthurian myth was Lancelot's son.
Freya and Merlin will become a Battle CoupleFreya seems to be learning how to control her powers as a spirit of the lake and she and Merlin still care about each other. Also, since Morgana's gone, there has to be another woman join the main cast to avert the Smurfette Principle. Merlin's power is more fire-based, being a Dragonlord, so Freya could support him with water powers.
Madame Mim will show upIt will be part Mythology Gag and part homage to Disney's The Sword in the Stone.
Gaius has been protecting Uther since the beginning of the Great Purge.Are we really supposed to believe that no evil magic users tried to attack Uther in the twenty years before Merlin came to Camelot? And if they did, how is Uther not already dead? It could be that Gaius has spent those twenty years doing what is now Merlin's job, running around and stopping these evil-doers behind Uther's back. No doubt it came as a relief to the old boy when a young helper turned up to take over. Smurfette Principle, but they will make her a poor man's Morgana who everyone inexplicably likes and who will become Merlin's Designated Love Interest.
This Merlin is the same Merlin in Harry PotterThe whole story takes place hundreds of years before Hogwarts was actually established.
Assuming the above is true...The castle of Camelot will turn into Hogwarts in the future and will become the academy for magic we all know and love.
The Love TriangleI'm calling it now: the scene that we saw in the season four trailer, Arthur walking in on what looks like a romantic embrace between Lancelot and Guinevere is a magical set-up. Either Morgana is sending Arthur bad dreams, Morgana is sending Lancelot bad dreams, or the Guinevere we see in that scene is not Guinevere at all. It's Morgana, disguised as Gwen, and trying to stir up trouble amongst Arthur and the knights. Which begs the question: where is the real Guinevere?
Gilly is GalahadHe's brave, pure of heart, and has magical powers to aid him. He might not be the complete Marty Stu Galahad from the original legend, but has the potential to nudge Arthur in the right direction regarding the nature of magic by dying as a knight of Camelot after protecting Arthur.
Mordred is the son of MorgauseMentioned earlier on the page, but it has enough merit to be recognized. Morgause appears older than Morgana, enough that having a child around his age is not out of the realm of possibility, and we really have no idea what she's been up to before showing up in Camelot. She might have given up the child to his Druid father or, due to prophecies, left him behind with supporters of the Old Religion. In "The Once and Future King", it is Morgause who is Mordred's mother, and Morgana being his aunt could explain their connection.
Morgana's mother's nameUther mentioned in 3x05 that Morgana's mother's name was Vivian (or some variation). Given that the show has already one character with the same name (Lady Vivian from 2x10), it's possible that they gave the mother that name because she will be the Vivian from the legend. But she was the Lady of the Lake, and that role has already been fulfilled by Freya...
Merlin is immortalI'm not sure how much of a WMG this is, since it's backed up by myth, but it needs saying. Evidence: Edwin couldn't kill him, the Cup of Life wouldn't take his, he survived the Dorocha touching him when it was explicitly stated that no mortal man could, and the Callieach wouldn't accept him as a blood sacrifice to close the Veil.
Everything is shown from Merlin's point of view, and Merlin has Black and White InsanityIt explains all the Moral Dissonance.
Old!Merlin will become Morgana's mentor and Parental Substitute.
While recovering from her poisoning, Morgana dreamt about the future...
The upcoming episode Lamia will parody the common Mary Sue
Merlin will save Camelot with an army of magic users
Merlin's secret will be revealed in the Series 4 finale
The series Merlin will end on a high note
Merlin is a Dragonborn.Seriously, it all fits. He can speak the language of Dragons, and has demonstrated usage of Slow Time (TIID KLO UL) and Unrelenting Force (FUS RO DAH). He's also the chosen one. However, in this 'verse Dragons aren't quite so bad.
Aithusa was sent by Mordred to heal MorganaKilgharrah, the Great Dragon, has said that Morgana and Mordred will form an alliance in the future. We do not have much of a back story on Mordred(as far as the show itself is concerned and we know how the show diverts from the original material), so for all we know he could have the ability to control a young dragon like Aithusa. Assuming Aithusa is not evil, nor naive of Morgana's cruelty, Mordred could have felt Morgana in danger, could not teleport to her, and was too far to reach her by foot, so he sent Aithusa to heal her. He could be a Dragonlord, or he could just be a powerful warlock that could control the young dragon.
Arthur isn't King ArthurHis son is. Series 5 will establish that Gwen is pregnant early on. The rest of the series plays out as you'd expect up to the finale, during which Morgana attempts to conquer Camelot (as per usual). Gwen goes into labor early on in the battle. Arthur assigns Merlin to look after her. The battle carries on, and Arthur and Morgana battle it out, eventually winding up in Arthur and Gwen's chambers, where Gwen has just given birth to a baby boy. Merlin manages to defeat Morgana, but Arthur is mortally wounded and dies in Merlin's and Gwen's arms. Gwen names her son after his father and tells Merlin to sneak him out of Camelot and have him raised away from the dangers of royalty. Gwen loses the will to live and dies shortly after. Merlin obeys Gwen's dying wish and sends the infant Arthur to live with a kind family of peasants before taking Excalibur and returning it to the stone. He then returns to Camelot, keeping the kingdom together despite its lack of ruler. Flash Forward twenty years, when a young man who looks uncannily like Arthur approaches Camelot from afar. Kilghara's voice then narrates: No young man, no matter how great can know his destiny...
Uther's Great Purge actually made magic stronger.Hence why Camelot was able to wipe out the vast majority of magic users and dragons, yet can't do a thing about it in the present age. A big part of the Old Religion is balance, so with magic so widely distributed, it was a lot weaker. There's also a lot of instances in show where non-Merlin magic users do things that are incredibly strong magic rather easily. One case is Servant of Two Masters, where Gaius mentioned that it would take a high amount of skill to apply a Fomorrah to a person, and yet all evidence seems to point towards Morgana doing this on a whim rather easily. Another is, while they needed magic to get the Great Dragon to Camelot, they were able to capture it the last time, and when it got out twenty years later they couldn't even fight it. It also might explain why Merlin and Morgana are so strong magically: they were born in the midst of the Purge. Nice Job Fixing It, Villain.
Merlin is set in alternate timeline...created when The Great Dragon (intentionally or accidently) travelled through time. His presence altered history, and he tries to put it right back. When he talks about Destiny, what he means is "how it happened the first time", but the future is already changed now.
The Girl of the Week will become a subplot for the Knights (and maybe Merlin) in Season 5While Arthur was single, he free to be teased with any lady that showed up to Camelot, but now that he's married to Gwen, obviously he's off the table. So now the Knights of the Round Table will have a turn for wacky romantic subplots in Season 5!
They will either not reveal Merlin's secret in Series 5, or have it as a cliffhanger endingJust for the sake of being trolls.
The dog Merlin brought to life is CavallMerlin put him in the kennel with the rest of the dogs, and Arthur grew attached to him and named him.
Sir Marrock or Sir Gorlagon will show up in Season 5
The basic plot of the show is actually a big metaphor for the struggles of a closeted gay personI'm totally serious here. There's a young man who has always been just a bit different from everyone else. He moves to a really intolerant place and has to hide this aspect of himself from everyone (magic = homosexuality). If people find out, the best he can hope for is to be shunned by all of society and the worst is death. Even though he has friends he loves dearly, he can't tell them because they might hate him for it and even if they don't, someone else could find out. He just hides it as best he can and hopes for a day when he can show people who he really is. Made Myself Sad...
Whoever captured and tortured Morgana and Aithusa will be making an appearanceHe/she will probably either see all magical people and creatures as weapons to be exploited or be a Knight Templar who may surpass even Uther Pendragon in their hatred for magic. If it's the latter and Arthur encounters them, their hatred and zealotry may make him reconsider his ban on magic.
Sefa will returnChances are she will want revenge on Guinevere for killing her father. If she allies herself with Morgana, she may even be trained as a witch to become more powerful and become Morgana's apprentice like Morgana was once to Morgause.
Sefa will become Merlin's NimueShe's already been lightly teased as a possible romantic interest and has the potential to become a sorceror like her father. She may play upon Merlin's own memories of his father to seduce him and ensnare him with her magic.
Mordred really is fond of Arthur and Merlin, but will still have a Face-Heel Turn and eventually kill ArthurAs this show has constantly stressed, You Can't Fight Fate!
Aithusia will out Merlin as a Dragonlord to Morgana.But, Morgana will not know he's Emrys- she'll just be infuriated that Merlin was part of the Old Religion, but still supported Camelot.
The Guinevere that went back to Camelot wasn't the real Guinevere, but a false one that thinks she's Guinevere.Guinevere had an Evil Twin in at least some of the legends. The last we saw of Guinevere, she broke out of Morgana's brainwashing and Morgana looked irritated. The one that went back to Camelot and is now completely in league with Morgana is a clone that Morgana made since time was running out.
Kilgharrah was a massive troll all along, and Merlin was just an Unwitting Pawn from the very start.He was the last of his kind and already dying while still confined in the cave. Upon feeling Merlin's presence he had a complete vision of everything up to Arthur's death, and the entire series was orchestrated by him from beginning to end in a twisted act of revenge against the Pendragons, and he used a so-called prophecy to his advantage to keep Merlin in line. The unification of Albion and the return of magic didn't happen, and worst of all he has Merlin believing that Arthur will some day return when in fact he is gone forever. The true Big Bad of the series was The Great Dragon after all, and he completely succeeded.
Merlin and The Dresden Files take place in the same continuityWhen Morgana brainwashed Merlin to kill Arthur, Merlin never tried to use magic. Perhaps explained by Rule of Funny, but also because, according to the mechanics of the Dresdenverse, Merlin didn't believe what he was doing was right, and this rendered magic an inviable method of assassination. Like how a mind-controlled Luccio, from The Dresden Files, used a mundane means (by sword) against La Fortier when she was a perfectly accomplished wizard.
Guinevere was The Chosen One all alongThink about it. How would the Christian conquerors have taken such a tale of a female monarch reforming the land for good? They would have ignored her and focused on Arthur. Arthur got most of her attributes in the retellings (creation of Albion, came from peasant folk, rose to status, wise and noble monarch), while Gwen got Flanderized into a cheating shrew whose one defining characteristic was her relationship with Lancelot. When the prophets or whoever looked into the future, they saw an enabler for the great queen to come, and so they made all these prophecies to put Gwen on the throne and in the position of accepting magic with Merlin as her advisor. Arthur was just a Red Herring.
Albion is ValyriaGwen became pregnant sometime around the finale and her son will continue the Pendragon dynasty. At some point, Merlin will wind up having children who will get together with Arthur's descendants to create what will become the Targaryen bloodline, thus giving them their mastery of dragons. Giant pyre hatching dragons? Nah, just the rage and grief of the last dragon lady calling them forth, now the third name had been decided on. Coincidentally, if the entire series takes place during a very, very long summer this also explains why winter is never seen or referenced. If Merlin is truly immortal, it is entirely possible that he lives past the time of the series until Westeros finally gets to the point of advanced technology, hence the truck seen in the finale Things like Valyrian steel are created during the magical golden age that presumably occurs post-finale. And perhaps Petyr Baelish has ties to a certain treasonous councilor...
Arthur and Guinevere were childhood best friends and/or sweetheartsAs a child, Arthur visited Sir Leon's court and became friends with Guinevere. The two became close as children, and at some point developed crushes on each other. When Gwen moved to Camelot to be Morgana's maidservant, Arthur had reached his training years, and started being more distant, ignoring her more. Her feelings remained, but she didn't like who he was becoming. He pretended to ignore her, but always kept an eye on her - if you'll notice, the first time he confronts his father about magic is for Gwen's sake, and when she stands up to him in A Moment of Truth, he actually listens to her and respects her opinion in a way their previous acquaintance on the show doesn't seem to merit. Whenever he says her name in the first season, it is full of amused affection, and he openly teases her after her emotional "don't die on me" pep talk in Le Morte D'Arthur (season 1 finale) as if they have a history together. In The Once and Future Queen, the two spend more time alone together at once than they have since childhood, and the crushes are rekindled. In the first season, they seem to connect on a different level from the other characters, not in a destined-to-be-soulmates kind of way, but in a know-each-others'-brains-through-and-through kind of way. It helps explain away the Strangled by the Red String plot line, and makes a lot of stuff make more sense in context. It also helps explain how they can so clearly care deeply for and love one another, and have such wonderful interactive/character chemistry, while having rather poor (YMMV, but it seems to be general consensus) romantic/physical chemistry. Their relationship on the show is wonderful, but the parts that work best give off a flirty best friends or even brother-sister vibe. When they try to do the epic sweeping romance "We are in LOVE!" it sort of falls flat. Reason? It's a deeply rooted childhood connection mixed with mutual respect and companionship mixed with longstanding puppy love!
Sooo, about that alien....I think it's pretty safe to say that at the very least, Merlin and Indiana Jones and the Kingdom of the Crystal Skull take place in the same continuity. The...uh, creature...encountered in "Arthur's Bane" has a glowing blue head, and it's about the right shape. It refers to its people being worshiped, presumably as gods, implying sort of an Ancient Astronauts thing. It's said to be the key to all knowledge, and like Indy said, "Their treasure wasn't gold. It was knowledge. Knowledge was their treasure." It also says that Merlin is wise not to ask it all sorts of questions, because hey, when Cate Blanchett did that, her eyeballs got burned out.