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The following are culled from the entire franchise. Below are the specific entries. Add to which one/s most appropriate.

The Live-Action Movies exist in universe as attempts to cash in on the gang's exploits
  • Unfortunately, Scrappy was so humiliated and enraged by his portrayal he quit Mystery Inc. Fred also didn't like the films, as he was portrayed as a womanizing Jerkass who perved on Daphne. When Daphne is about to mention Scrappy in the Spook museum, Fred silenced her because he hates being reminded these movies exist.
Scrappy died after the Reluctant Werewolf
It ends with Dracula, Crunch, and Brunch at Shaggy's house looking for revenge. They do get revenge and kill Scrappy and Googie for helping Shaggy win. This is why neither is seen again.
Scrappy is in the witness protection program
The final episode of the original Scrappy-Doo series sees him going to visit these two other dog friends in New York City where he lived before Scooby took him in. Throughout this episode, Scrappy is shown to be in danger, as usual, however, this time instead of monsters it's mafia-like criminals. I think that it is likely that Scrappy was involved in organized crime such as this and was reassigned to Scooby. He might not even be related to the Doos at all. This would also explain why he is living with Yabba Doo and later disappears altogether. He is shown revisiting his old friends which for obvious reasons is a horrible idea. It is likely he has tried this before and also likely blew his cover and that is why he has to keep being assigned to new families.
They will make a sequel to Witch's Ghost
Why not if they are making a sequel of Zombie Island.
Googie and Crystal will both come back and try to woo Shaggy
It would make for an interesting plot.
A pup named Scooby-doo are dreams of the gang as adults
It explains the weirdness of the whole series.
Fred was in foster care.
Hence why his family is so inconsistent.
There are multiple continuities in the Scooby-Doo franchise.
With how many years it's been going combined with multiple different incarnations set in different periods, this is the only way to rectify the amounts of Anachronism Stew, Technology Marches On, Negative Continuity, etc, & is the only way to go about watching future installments of the franchise & not having an aneurysm if you're part of the fickle type.Different times the continuity either splits off into a new one, is an alternate continuity to previous works, or is something new entirely:
  • The 60s-70s stuff can be one continuity due to the number of fictional characters that show up, is the first series, the gang are teens that go to high school, & travel around on the weekends, or school breaks, for when their adventures take place.
  • The 80s & some early 90s tv shows & specials that are more mythology-based rather than the normal formula is another. The gang are young adults, or not even seen in Ghoul School, Reluctant Werewolf, Boo Brothers, & the shows with Scrappy. This is also the continuity where Scrappy exists, due to him only being acknowledged here & the first live-action movie.
  • A Pup Named Scooby-Doo due to the gang being younger than previously or later established for when they started solving mysteries or even met each other.
  • The '97-'01 animated films, which could be set after the 60s & 70s stuff continuity-wise, but I'm not sure because of the time displacement. Due to that this is also apparently the first time for any of them that real monsters & ghosts showed up, so the majority of the 80s & early 90s stuff is negated along with the New Scooby-Doo Movies' episodes that featured supernatural elements & fictional characters not native to Scooby-Doo, but this is also due to a more haunting & realistic feel than previous stuff. Though they also double up as paying homage to zombie, mystical, alien, & sci-fi B-films from decades passed, which give them their unique feel from each other as well.
  • What's New Scooby-Doo? & the 2000s animated films due to the same art style, writing style, etc.
  • The first 2 live-action films, which could be continuing from the original in its way. The gang splitting up for at least a few years & regrouping never happened before the events of the first film, so Zombie Island never happened, they're young adults, & this is the first instance of real ghosts. Possibly throw Cyber Chase in here as well, since they finally entered the 21st century in that one. This is also the one most easily placed in the 60s-70s continuity due to the second film having copious amounts of Continuity Porn for longtime fans & kids who'd seen reruns of the older shows & movies on Cartoon Network, Boomerang, & the home media releases. It also, like '89 Batman & The Mask, has many things that make it least in the second film because you could easily place the first in the early 2000s from when it was made & released, due to the way it's filmed, the tone, & some obvious artifacts of the time.
  • The second 2 live-action films, which can't even be considered prequels to the first 2 due to different character developments made as well as being in the late-2000s due to technologies & fashions not being invented, or popularized until then.
  • Scooby-Doo Mystery Incorporated since the creators said that's what they were going for & that it can't be a Stealth Prequel by any means to the original series no matter how much the creators wanted it to be, plus the fact that later stuff doesn't reference it at all. Plus their town name is Crystal Cove instead of Coolsville as was previously established for some reason. Not even the timeline reboot at the end of the series changed that.
    • That, and "Curse of Coolsville" sounds rather cheesy.
  • The 2010s films. Due to copious amounts of Negative Continuity & new time placement, this is a given. (By the way, does anyone know if the gang's supposed to be in late high school, or college in this one?)
  • Be Cool, Scooby-Doo. Obvious due to the art & tone shifts.
All of these represent different continuities in the franchise, whether on purpose or not. You could also say anytime a voice actor's replaced when there's a very noticeable art shift, tone shifts, or when the characters change their main outfits.
  • The Alternative theory fronted by fans of Scooby and many of his sibling entities is that they just exist in a faulty timeline. Either by birth or caused by several decades of animated shenanigans, their normal is always in flux and you should come to expect it.
  • We could take this into a more out of universe way as well as in-universe, but that's a whole major issue of a Broken Base.

Shaggy is on some sort of drug.
OK, we shouldn't lose anyone here. Not only does he have conversations with his dog, but he is also constantly hungry (the munchies) and extremely paranoid about the existence of ghosts. The only thing is, we can't tell exactly what he's on. The constant munchies suggest pot, but the talking dog and paranoia things suggest a hallucinogen of some sort. Oh, and how do you justify the rest of the gang understanding Scooby? Contact high.
  • Even better: pot actually is a hallucinogen at very high doses or with certain strains, or so I heard.
  • Paranoid about the existence of ghosts? It's not paranoia. There really are (fake) ghosts out to get him all the time. (Eventually, real ones as well.)
  • Scooby Snacks are hash brownies. Or maybe hash cookies. This is why Shaggy is so willing to eat them and why they cause him to exhibit odd behavior.
    • Hash brownies all the way. The sad implication is that Daphne (who doesn't eat them) carries a box of them just to bribe him and Scooby into danger. Exploit your friends' vices: this is the Aesop.
  • Everything that happens in every series, including the traveling and the existence of the other characters, is just Shaggy hallucinating from too much LSD or some related drug. To explain the constant munchies, he's just a regular old Big Eater.
    • This could mean that Scooby is either just a normal dog or not there at all. And anyone else who communicates with Scooby is just yet another hallucination from Shaggy since the entire show is from his point of view.
  • The idea of Shaggy being a druggy has been around for nearly as long as the show has been on, but what confuses this troper is why people choose weed as his most likely drug of choice. It would explain the munchies, but that's about it - it wouldn't explain any other aspects of his personality, and in some cases, it would contradict them! The drug generally relaxes people, an effect we never see on Shaggy, and his general nervousness, shivery movements, and hallucinations that cause him to think his dog can talk suggest that he's recovering from an intense heroin battle! The addiction caused him to lose loads of weight (which is why he's so skinny) and he wants to reverse those effects and return to normal ASAP (which is why he eats so much)!
    • Pot can easily make you paranoid if taken in an unfamiliar setting, at high doses, or with other drugs.
Shaggy is a Vietnam Veteran who was in a K9 Unit.
He somehow was stranded in Vietnam, his dog was killed, and he ran out of food and he ended up having to eat the body of his dead dog. This explains his constant desire to eat (he's not particularly hungry, he just never wants to be hungry again) and his hallucination that Scooby-Doo can talk: it's caused by guilt because he feels that it was wrong to eat the dog. Also, he is always afraid of getting into scary situations more than the scary situations themselves, which could be because he wants to avoid ever being in danger again, and/or is afraid that he'll snap and hurt someone if he ever gets too frightened.

Each member of the gang represents the "Five Colleges" in Massachusetts.
  • Daphne= Mount Holyoke
  • Velma= Smith
  • Fred=Amherst
  • Shaggy=Hampshire
  • Scooby=UMass

A popular legend explained on this site.

  • That or the Claremont Colleges in California.
    • That would mean Velma is Harvey Mudd and Daphne is Scripps, but what about the other three?
    • Shaggy would be from Pitzer and Fred from CMC, so Scooby could be from Pomona. Honestly, though, the last one doesn't seem a particularly strong fit. Can anybody do better?
      • The reasoning that one can apply to Scooby = Pomona is that each could be considered the best known of their respective groups. However, it is rather a stretch.
      • Scooby is also not necessarily representative of a college, as he could be considered an adjunct to Shaggy.

The Scooby Gang are on a paid tour of enacted "mysteries".
They signed up for a package deal— travel to a few dozen "haunted" houses around town (often made up to look like they're in various parts of the country), and try to figure out the scam at each one. The so-called "breakdowns" that "coincidentally" put them on the doorstep of a building that someone in a rubber mask is trying to "swindle" away, are all part of the act. Even Shaggy and Scooby enjoy the events; they act scared to get into the spirit of the event.
  • They took a mystery cruise once. They ran out of fake mysteries quickly.

All the monsters are real...
And ripping off their heads kills them. Shaggy and Scooby just perceive it as a mask being taken off. This is why, episode after episode, they keep thinking the current monster is real: It is. It's the insanity battling with reality.
  • We are watching the show through Shaggy and Scooby's drug-induced influence! If this is the case, then the show from a true omniscient POV would be unsuitable for Animation Age Ghetto.

Some member(s) of Mystery Inc. are Reality Warpers
Whichever one or two of them that are reality warpers are powerful anti-mages like Doctor Thirteen. As explained in The Books of Magic, not believing in magic strongly enough can cause magical events to lose their magic and become reality.

Velma has known everything since the beginning
She just runs away because she's not trained to fight against bulky guys. (That, and she can't see without her glasses, which makes them an Achilles' Heel.) She told the others to solve mysteries, but she was the only one who was skeptical and knew what to do. If we don't consider the later shows, she was the group's leader but acted like the shy nerdy girl.

She also might have a Death Note hidden somewhere. It's rare to hear about or see a bitter criminal wanting revenge; she kills them as soon as they enter prison.

  • Since this only applies to earlier shows - what's the cutoff?
    • When do the monsters start being real?

The different incarnations of the show are from a different character's perspective
The original series, with a more serious take on things, was Freddy's perspective with him as the hero. What's New, Scooby-Doo? is Daphne's viewpoint, with things being Lighter and Softer. The upcoming Scooby-Doo! Mystery Incorporated is Velma's perspective, with things being much more grounded in reality and her being the main heroine. Finally, the movies are when things got way too real for Shaggy.
  • So is Be Cool from Scooby's perspective, because he's trying to be cool?

The Monsters are always real.
What's more, the main characters know it, and are government/Technocracy agents whose job it is to dispose of the reality deviants, wizards, and monsters; cover up the evidence, and convince the locals it was all a hoax. This explains why after so many 'hoaxes' they don't just tackle the guy in the mask at the beginning, and how someone in a bulky costume exhibits super-strength.

Shaggy and Scooby hail from an alternate timeline or universe...
...where their laws of physics are quite different and they escaped into Fred, Velma, and Daphne's world for some reason.
  • This would explain how Shaggy and Scooby can eat so much.

Freddy and Daphne are straight
...And in love with each other for real. They're not The Beard for each other. Velma isn't a lesbian, she just hasn't met anyone she'd like, or everyone she meets turns out to be evil. (Ben Ravencroft anyone?) I know that this is a WMG bordering on insane since every knows that everyone on that show is homosexual.

The only person Velma's ever kissed was Scooby (Pup episode) and in the movie "Camp Scare" she is repulsed when a camp ranger flirts with her. Scooby-Doo! Mystery Incorporated has her pining for Shaggy. So who knows?

  • Velma's love interests didn't occur until the later years. In the original, she dances with Shaggy once but it's used for a gag to let Scooby cut in.

Scrappy's father is the dog from Duck Hunt
The only way it makes sense...

Scooby-Doo and the Alien Invaders is an allegory for the Holocaust.
I was watching the movie earlier today and found the ending message of tolerance towards what you don't understand a bit confusing. They can't mean tolerance towards aliens, can they? that won't be an issue for at least another century! Well maybe they mean tolerance towards other races/homosexuals, but that makes even less sense when one remembers that the good aliens weren't obvious at first and that they were in a heterosexual relationship with Shaggy and Scooby during the movie. So that leaves one final group: The Jews.

The rest began falling into place: The gang gets their car into a slump (Post-world war I economic downturn for Germany) and are led to believe that ugly green aliens are to blame (Jews with stereotypically Jewish features and traits) and decide to help their new friends at Seti (Hitler and other heads of the Holocaust) find them before they can cause more problems (Representing the transition from German citizen into Nazi soldiers). Along the way, both Shaggy and Scooby meet girls similar to themselves whom they assume are from Earth (Germany) and court them, being them not interested much in finding the aliens (Carrying out Hitler's master plan) Meanwhile the other three try to dig deeper into the alien mystery (Carrying out the war) but are kept away from some sort of secret mountain(The camps) by MP's (The Gestapo). Wishing to get to the bottom of things, they sneak into the mountain(camp) and discover that the members of Seti (Hitler&Co.) are creating the false image of the green aliens (Evil Jews) so that they may carry out their master plan: digging up mountains of gold (Taking over the world and killing Jews.) and that they paid off the MP's (Gestapo) to do their bidding.

The game steps in to stop them, but their machinery (Economic/political) power is too great. So in step two mysterious outsiders stop them: both aliens (Jews) at first the gang is horrified, but then they come to realize that these aliens (Jews) are Shaggy and Scooby Doo's girlfriends. At this, they stand together and turn in the thieves (Overturn the rule of the Nazi party). And though whatever anti-extraterrestrial (antisemitic) has been done has been undone, the Benevolent aliens (The reality of Jews; normal, un-evil people) realize that Earth (Germany) is no longer a good place for them and that they should return to where they belong: Their home planet (Israel).

Ok, first off I'm not antisemitic, this is just an allegory, and second, this is a WMG, who cares?

This so-called "monster" is a criminal in a costume!!!
The ghouls and goblins are normal men and women who take advantage of superstitions based on local legends to scare people away, lest they discover a hidden treasure or an illegal operation that the "ghosts" are trying to keep under wraps.
  • I never thought of that! And the things they use that make them seem real are all machinery or trickery as well?

The gang is a group of ghosts being faced with eternal torment in purgatory for past crimes.
Here's my theory: All of the kids are dead, Scooby is a demon tasked with watching over them while they work at solving "mysteries" to make up for their past crimes, which are:

Fred: A bullying, womanizing sociopath in life. Explains his pushy, overbearing attitude and his constant insistence on solving the next mystery. He still hasn't learned his lesson and is only wanting to finish his punishment as easily and quickly as possible. An egotist, he postures himself as the leader despite his flawed plans.

Daphne: A vain woman who used her body to get what she wanted, very promiscuous and obsessed with fashion and social hierarchy, sometimes to the point that it clouds her better judgment. Seeing Fred as the strongest and with the most power, she placates him with sex to curry favor with him, which is why they're usually seen going off together.

Velma: An introverted bookworm who gave more attention to her studies than she did to friends and family and purposely isolated herself from the outside world. Mixed with what she once considered "common riffraff", she must learn to cooperate and build relationships with other humans if she ever hopes to ascend to a higher plane.

Shaggy: A junkie who died of a drug overdose. He has formed a bond with Scooby over time and, though he hasn't learned his lesson in the least, has inadvertently provided the rest of the gang with the semi-freedom they enjoy. Because he is high all the time, he's the only one who doesn't notice that Scooby isn't nearly as afraid of everything as he would have the gang believe.

  • Or alternatively Shaggy: A young man drafted to serve in Vietnam who killed himself (drug overdose or otherwise) rather than be forced to serve in Vietnam. He experiences the same things that the soldiers there did: constant hunger and starvation (no matter how much he eats, it will never be enough), the terror that an unknown enemy that turns out to just be other humans can hurt or terrorize him at any time, but he also is given the camaraderie that soldiers feel with Scooby so that he knows it would have been better to live.

Scooby-Doo: A high-level demon who was assigned to keep watch over the four kids, ensuring that they each learn their lesson and is not allowed to release them until they do. He has gotten attached to them over time, Shaggy, in particular, due to them being Birds of a Feather, and as such Scooby has loosened his grip on their leash quite a bit, allowing them luxuries they wouldn't have normally had otherwise(like staying in hotels and going to barnyard dances). Should they get too comfortable in one place, however, the goofy and lovable act will quickly fade as a much more aggressive side becomes more prominent. He may secretly care about the group (Shaggy in particular), but they all see him as a horrible monster that they must fight to one day escape.

They are never allowed to stay in one place for long, and the kind and friendly behavior they exhibit is merely a ruse they put on to seem more convincing. They're learning, however, slowly but surely. The Mystery Machine is their tomb, which they can't stray too far from without inciting Scooby's demonic wrath. The fear of that wrath is the only thing holding them together. If it was gone, they would split up(for good) and haul ass to the ends of the earth in an attempt to escape the canine horror that mocks them with his silly grin and put-on cowardice.

Scrappy, on the other hand.... He's just a manifestation of Scooby's inherent demonic sadism created to torment and undermine the group's suffering when he feels that they have grown too complacent with their current situation. Or, alternately he could be Scooby's apprentice, who he dislikes, but has to keep around.

The gang is dead, and in purgatory, take two.
A slightly different interpretation of the "they're dead" WMG above. The Gang was traveling in the "Mystery Machine" sometime in the late 1960s when they were in a car accident that killed them all. After death, their souls became trapped in purgatory. This explains why every building they visit is abandoned. Scooby-Doo, who in life was a normal, non-talking dog, takes on the role of a sort of "spirit guardian" whose job is to keep the gang safe after his death. He is the only member of the group that is in a purgatory of his own free will. He could've gone to heaven, but instead decided to enter purgatory. This is because of his strong domestic dog instinct to protect his humans and a sort of "animal sixth sense" that helps him understand the actual danger the gang is in even if they don't. The monsters are actual demons, which Scooby-Doo, in his role of protector, ends up defeating in every episode, this is because since Scooby-Doo is the only member of the group without sin, he's the only member who the demons don't have power over. After Scooby defeats the demons, the gang's minds, cause them to hallucinate that the demon is just a guy in a mask. This is to protect their psyches from learning the truth they're not ready to learn. The world is derived from their collective sub-conscious, for example, the "creepiness" of the places they go, and the forms the demons take come from Shaggy, the biggest coward of the group, while the "clues" that Velma find are fabrications of her rational mind trying to make sense of what's happening.

Scooby thinks that he's the reason the oddballs in the costumes are chasing the Gang.

Every so often, Fred or Velma will ask Scooby to act as a sort of bloodhound and get him to pick up the scent of the petty felon in the mask messing with them; the problem is that they tend to be hazy on the fact that Scooby can't turn his sense of smell on or off like a machine. Like any other of his senses, it's on twenty-four/seven; that means that the costumes can't and don't keep him from knowing who the crook in the suit is. To him, it's just another suit of clothing that the person happens to be wearing; since people know that he can speak English, he thinks that his ability to identify the malefactor du jour is a source of danger to the teenagers that happen to be in his vicinity. He only feigns a belief in monsters so that the gang doesn't realize this and put themselves in harm's way trying to protect him.

Scrappy's family doesn't want him either.

Why do you think the first time we see him he's stuffed in a crate and shoved out of a train?

  • Fridge Logic. Scrappy is related to Scooby.
    • I dunno, lots of people call family friends or guardians "Uncle." Scooby's explanation of Scrappy's parentage could just be a way to save face and protect Scrappy's feelings.
    • Sort of Jossed by Scrappy's Birthday. Scrappy tells his mother he wants to go with his Uncle Scooby. If the credits are canon, perhaps Scrappy snuck away mailing himself in the package. If you were Ruby Doo, would you want your son running around with your brother that runs into some monster everywhere he goes 24/7?
    • On the other hand, in the episode we see Scrappy's old neighborhood, and while Scrappy loves it, it's clear to the viewers (And Scooby and Shaggy) that it's hardly the Ritz. Likely the box on a train was the cheapest way to get him to Scooby and a better life.
  • It's also worth noting that despite being Scrappy's old home, Ruby doesn't show up at all. If something happened to her, then would that be why Scrappy went to live with Scooby?
Crystal and Amber are Plumbers.

As we know, they described themselves as police officers from a distant solar system; given that they probably know Max Tennyson, it's not hard to realize that their excuse about dressing like hippies because the TV signals they've picked update from 1970 is a lie. They're probably following his "If you find a look that works, stick with it" philosophy.

Eating Scooby snacks makes you part dog.
This is why Shaggy understands Scooby, he's at least partially dog. The others don't understand Scooby, they just kinda guess by his gestures, something any human can do. But Shaggy is the only one to respond to Shaggy's words. I can also explain some of the other things that most people pin on a drug habit. Dogs also have a large appetite. And his heightened senses make him paranoid because the human mind isn't designed to deal with that much input.

The cast is college age
They go all around the world without ever getting in trouble with the law for being underage. I guessed they were 18+ because you could be a legal adult and on your own at age 18.
  • They hated being called "kids" in Scooby-Doo and the Witch's Ghost.

The Mystery Gang work for the FBI.

This cartoon is a precursor to The X-Files.

Scrappy is a very kind and shy puppy off the set
He rarely talks to anyone, or at all at that. He deeply regrets his role on the show, and wishes he could have taken it back if he could.

The gang sets up all the monster hoaxes and "stops" them for fame and money.
Think about it. Why else would it be that EVERY town they stop by suddenly has a monster issue? They find someone in town to think of a motive and dress up as a monster to scare people. The gang catches and exposes the monster to make it appear that they solved the mystery. They share part of their reward money with the "criminal".
  • Alternately, Fred set it all up in an attempt to impress Daphne, or maybe Velma set it up to impress Fred.

The reason Shaggy connects so well with Scooby and enjoys Scooby Snacks is that he's a werewolf.
It's established in Scooby-Doo! and the Reluctant Werewolf that Shaggy is next in line to be the wolf-man. That's why he displays super speed, strength, stamina, etc, and why he can eat dog treats. He has canine genes. Even before and after his transformation the werewolf genes were dormant inside him.

  • Probable. As long before Reluctant Werewolf we find Shaggy's family had a werewolf curse. So it turns the fact that he was destined to be Dracula's new werewolf become a mythology gag. It was his ancestor Shaggy the First's medallion that started the curse, but it seemed to have predestined Shaggy for transformation as well. Whether or not other descendants got it too, is a good mystery.

The reason Scooby can talk.
The people in the Scooby-Doo universe can use Full Metal Alchemist like alchemy and they created Scooby-Doo as a talking human/dog hybrid chimera who just happens to look very very dog-like.

The reason Shaggy and Scooby are afraid of ghosts is that they had to kill a demon once.
As it turns out, Scooby-Doo! Mystery Incorporated seems to be the origin story of the Gang. Since Scooby and the others remember the fight with the Nibiru entity, he and Shaggy are worried that all the oddballs in the costumes might herald a lesser version of the same monster.
  • Let's not forget that they had to watch as the Entity ate pretty much everyone that they knew. Sure, they came back afterward but hanging around the previously dead isn't going to do wonders for anyone's peace of mind.
  • Or, as seen in The Mystery Begins, their first mystery involves actual ghosts.

"Coolsville" is an ironic name the gang have given their hometown of Crystal Cove.
To continue with this, the Gang all have a certain degree of trouble dealing with the fact that saving Crystal Cove has made it no longer the town they all remember. While they like the idea of the people living happy lives free from the Nibiru entity's influence, part of each of them sees the place as being halfway to being too perfect, and thus refer to it by a seemingly-complimentary nickname that hides their real feelings.

Stage Fright's promises a twist....
...and my guess to it would right up the "Twilight Zone" and "Outer Limits" neighborhood. The gang had decided to set a trap. Freddie explains the trap as usual — but before he can send Shaggy and Scooby-Doo out to get the villain. They heard a lot of noises similar to how Freddie imagines Shaggy and Scooby-Doo would have made from the trap. The villain is trapped, unmasked, and his plan reveal. The gang is about to leave when they heard voices similar to Scooby-Doo and Shaggy from the trap. They pull out another Shaggy and Scooby-Doo from the trap. This puzzles the gang and Daphne is about to groan about feeding four cowardly eating machines — but another Daphne enters with another Freddie and another Velma. This second Mystery Inc. is the gang from Scooby-Doo! Mystery Incorporated. As the two Shaggy and two Scooby-Doo eat, the Crystal Cove gang and the Coolville gang compare notes on their hometowns.

At some point, the gang from Be Cool, Scooby-Doo will run headlong into the cast of Scooby-Doo: Mystery Incorporated.
This is because the people from the Denser and Wackier version of the timeline are the people that the Gang that destroyed the Nibiru entity believes themselves to have displaced. Every so often, the gang from the new series will come across clues that there's another van with another group of meddling kids and a talking dog with a speech impediment on their road trip. At one point, the Scooby who knows that he's part alien will end up in the wrong van; the result will be that both gangs will end up comparing notes about crooked real estate developers in rubber masks.

Scrappy is dead
In the first live-action movie, he tries to kill off an island, steals their souls, and take over the world, in a later series, Scrappy appears as an exhibit in a museum, that Scrappy is the real Scrappy who was killed and stuffed, that's why Fred said they vowed to never speak of him again.

Shaggy is a furry
Shaggy has worn several animal costumes and masks, and he also got to be turned into a werewolf, and he probably secretly enjoyed it in the back of his mind. He also apparently enjoyed masking up as Scooby-Doo at the end of "Never Ape an Ape Man," which helped to fuel Shaggy's furry fetish. In 2003's "A Scooby-Doo Halloween," Shaggy even dressed up as Scooby for his Halloween costume. This would also explain why Shaggy has such a strong relationship with Scooby-Doo (though he most likely is still straight, as seen in some productions.)
  • Well, the point about Shaggy unconsciously enjoying being a werewolf is slightly hard to swallow, considering the lengths he went to turn back to normal...

Talking dogs are not that strange in the Scooby-Doo universe
They live in a world with a Batman and Robin they have been on adventures with. It wouldn't be unlikely that other superheroes exist as well: Superman, Krypto, etc. Given that they live in a world of superheroes and supervillains, talking dogs would not be much of a shock to anyone. It also explains why everyone believes the monsters and ghosts are real, because in their world, more often than not, monsters and ghosts ARE real.

Shaggy's Uncle in Boo Brothers was the owner of Great-Grandpa-Scooby
In the era of the shorts, we get to meet Scooby's maternal great-grandfather as a ghost who served during the civil war. Now Shaggy also had an Uncle (or Great or Great Great) who also served? What if Shaggy's Uncle was Scooby's owner and the reason he chose to leave his fortune to Shaggy was that he knew Shaggy loved his Scooby as much as he had loved his Scooby all those years ago.

We'll get animated costumes to come alive as a movie for Scooby's 50th
It's been done in live-action, but can be so so much more amazing in animation. It's like the pipe dream and the perfect thing to do for Scooby's big birthday. They may even be slowly testing the waters for it, In Frankencreepy we saw classic criminals again but not in their costumes, and Mask of the Blue Falcon, the opening has HB heroes saving the gang from classic villains.
  • Maybe the plot could be someone bringing the costumes alive and they try to take over the world, where Scooby and the gang have to solve that mystery, and cameos of other HB characters help subdue all the now alive costume monsters.
  • Jossed that it doesn't look like that was the plan for the 50th but doesn't rule out the idea won't ever happen on any other year.

Shaggy isn't a coward, he's just more sensible than Freddie.
Freddie is always wanting the gang to "split up and search for clues." Shaggy calls him on this not because he's "chicken," but because he's savvy enough to realize safety in numbers is the best plan for the situations the gang finds themselves in. It's better to make whatever hostile party is out there have to take you all on simultaneously rather than splitting up and allowing them to pick you off one at a time at their leisure. Sure, the monsters ultimately turn out to be people in costumes, but quite a few of them were also dangerous criminals who were prepared to do some dastardly things to the kids.

The "Mystery Inc." kids from "Scooby-Doo" are draft-dodgers on their way to Canada
Another interesting theory that was mentioned on Reddit. The show's premise seems fairly innocent unless you see it as taking place in the real world of America in 1969 (the year it debuted), and you start to wonder how four mismatched kids wound up living in their van while on an endless cross-country road trip with no clear destination. After all, the show never really bothered to tell us where they were driving all that time, right?
The answer? It's 1969, the Vietnam War is at its height, and millions of directionless young people are desperate to avoid being drafted into military service. Hence, they're on the road to Canada to dodge the draft.
Consider all four kids, in turn:
Shaggy is the classic hippy, a longhaired jive-talker with an eternal case of the munchies who only goes by his nickname. You don't question his decision to go off the grid and live in a van with his dog, because it seems completely natural for a kid like that in 1969. He named his van "The Mystery Machine" because he dreamed of pulling a Jack Kerouac and finding the answers to life's mysteries on the open road, and he took his beloved Great Dane with him.

Fred is the comically clean-cut suburban kid who seemingly has no reason to leave home and hit the highway. While you don't question Shaggy's decision to go nomad, you have to wonder about him. But of course, there's a reason: his draft number just came up, and he's decided to leave home for a new life in Canada.

Daphne is Fred's beloved fiancée who's opted to follow him North. Fred didn't want to go to Vietnam because he couldn't bear to leave her, so she joined him in his roundabout travels.

Velma is a rebellious young antiwar activist, devoted to standing up for her ideals at any coast. With the short hair, black glasses, and baggy sweater, she looks like a caricature of a Vietnam protestor from 1969...because that's exactly what she is. She joined Fred's group to flee her old college campus when a protest turned violent, and she feels a protective instinct towards Fred because he's a draftee in danger of being sent to his death in a war that she opposes.

All of the mysteries that we see in the course of the show are just diversions that the kids encounter on the road to freedom in Canada. At heart, the show is a journey into the American heartland from the perspective of four disillusioned children of the 1960s.

Scooby-Doo was named after Scooby Snacks, and not the other way around
Shaggy named his dog after one of his favorite treats.
  • Confirmed in SCOOB!

Shaggy has galaxy wallpaper because it reminds him of Crystal.
In Scooby-Doo! and the Monster of Mexico, it is shown that Shaggy has galaxy wallpaper in his bedroom. This might be because he still misses Crystal and wants a small reminder of her.I just Made Myself Sad.

Daphne is T.D.'s younger self, fun-loving, optimistic, and in many ways more psychologically whole than the others. Fred is his older self, mature, cynical, and completely contrasting to Daphne. He's also very protective over her, and of all of them has the most traumatic past. Velma all of T.D.'s memories, everything he's ever learned. She also contains his fears and anxiety, stuff that the world doesn't associate with guys, thus he hides it away with timid little Velma. Scooby is T.D.'s memories of Scooby, but, as seen by Scooby's Taken A Level In Jerkass, the memories are warped. Shaggy is Daphne's antithesis, optimistic with a high opinion of Scooby, but is rather dependent on Scooby, but the relationship is portrayed not as ideally as before-Scooby is portrayed as disloyal to Shaggy and gets angry at him easily. So Daphne's theThis explains the wildly different animation style, almost as if being viewed from a different pair of eyes, the Flanderization, and the randomness. Plus the subtle dream/sleep motif going on-("Wake Me Up to say Goodnight" the name of the case music from trading chases, "Bad, Bad, Dream" From Me Myself and AI, "Kitchen Frightmare" a play on Nightmare) It's interesting to note that Velma and Fred are both acting fairly like their original incarnations, almost as if the dreamer knew them from that time (Be they an avid watcher of the show or knew the gang in-universe) In fact, the only one NOT acting like themselves is Daphne, so it's safe to assume that the dreamer chose her as their main persona. At this point, one would assume that the dreamer is a girl, but that alone is weak proof, considering that the entire gang is also a product of the dreamer's imagination and parts of their mind. The dreamer could have chosen Daphne for any variety of reasons, for example, it didn't feel like they could relate to Shaggy, or was upset with Fred and Velma, and preferred to "interact" with Scooby over "being" him, that would only leave Daphne, but those are just examples. Shaggy is the yin to Daphne's yang, Fred is the yin to Velma's yang. Shaggy is everything T.D. fears that he could have been, Velma is everything hidden within him.

  • Mystery 101
  • Daphne's puppets are basically what the mind is doing throughout the episode-playing around and learning about the gang.
    Fred: Daphne saw a "Create your puppet store" and decided that a fun way to learn about yourself would be to see yourself in puppet form...
Hence why "Daphne" has puppets of everyone and not only herself.
  • Speaking of Fred, he is the second most important mind-fragment in this mind world. He plays the rational part of the mind and is most unsettled by Daphne's quirks, indicating despite being damaged somehow (Hence the coma) they do know full well how bizarre the quirks are. But the quirks do play a role in working through the mysteries (Personal issues, pain from possible coma-inducing injuries, disguised as something The Dreamer would find fun and manageable) and thus puts up with them, ( Barely, And with help from the other members of the dream-gang) wanting to wake up as much as Daphne does.
  • So, where is the real Daphne in this mental world? The Daphne-puppet in the first episode, since the actual one is already taken as the dreamer's persona.
  • When the gang is fighting mid-episode and Daphne gives each member puppets of the other, The Dreamer is most likely venting secret pet peeves about mystery inc, or admitting the gang isn't all their cracked up to be all the time, or something of the sort, like how Shaggy's fearfulness and constant hunger can make him seem childish, Fred's actions sometimes make it appear that he puts his friends on a lower priority than solving mysteries, Velma's obsession with books, Dream-Scooby and Dream-Daphne chide the dreamer for being occupied with puppets for the last fifteen minutes or so. Daphne, who still had Scooby, has only nice things to say about him. Scooby is too important for The Dreamer to lessen their image of him...yet.
  • Of course, the puppets scenario opens up more possibilities for an alternate reality. Daphne's explanation for buying puppets sounds like something that could take place in therapy; maybe T.D. has issues with the gang? Maybe this is a therapy session?
Interestingly enough, the Daphne puppet is dropped midway through the episode. This too has multiple explanations. One possibility is, juggling between the two Daphnes was exhausting for the mind, plus playing with puppets forever wouldn't get them any closer to waking up. (Notice that after this moment the puppets aren't mentioned again) The episode is nearing its end, Daphne is slipping down a rope, but her puppet is interfering with her grip. Perhaps the mind feels it needs to let go and fully assume Daphne's role for the time being. This is why Daphne's puppet's heroic sacrifice is so significant. For the next few seconds or so, The Dreamer is completely utterly horrified at the loss of Daphne, but then a more lucid part of his mind remembers that it is just a dream, Daphne is perfectly fine, and it's only a puppet after all, which is why suddenly the slow dramatic fall and music stop all of sudden.
  • Game Of Chicken
Daphne's new quirk is reciting the gang's adventures in the form of a nature documentary, which is still T.D. familiarizing themselves with the gang and by extension their mind. The two subplots (Scooby's anger at Shaggy, Fred's friend) revolve around friendship, which they choose to portray through fighting, teasing, pranking, and graffiti, indicating that T.D. doesn't care for sappy stuff.
  • Also, it's interesting how many episodes are reimaginings of old Scooby-Doo, where are you? This might lead one to think that T.D. watched Scooby-Doo, Where Are You? Or is even one of the gang...until you remember how different they are from the original episodes, almost as if T.D. only had a few details and filled in the rest. Either that or it's the severity of the coma...
  • Throughout the Episode, the Dreamer is trying to figure out the relationship with Shaggy and Scooby, and examining each member of the gang individually.
  • Each episode has a motif. Something that the dreamer is trying to workaround. Sometimes there is more than one.
    • Mystery 101: Acceptance
    • "Game Of Chicken": Distrust of Birds. NOT chickens, more likely a predator bird, (I mean, check out those beaks in some shots! That looks more like something you'd find on an eagle or something) The mind selected chickens to demean the enemy but still depicts them as very fierce, and persistent. In the end T.D. overcomes their prejudice (mostly, the gang is still clearly startled to find Rick and his chicken in the back).
Rationality vs. Irrationality. The mind clearly has fun running headfirst into a situation, but sometimes that doesn't work, and finally reconciles the two.
  • All Paws On Deck
    • This one is slightly different from the others, as Daphne doesn't have a quirk in this one. Oh, yes, there are the dolphins, but they're not something T.D. deliberately does as a way of coping with the mystery, just the way Daphne is not deliberately trying to initiate rivalry with the dolphins (And the rest of the sea life, but let's just focus on the Dolphins right now.), it's already happened. Daphne doesn't act afraid of them-but she does act afraid of Fred finding out)
      • Throughout the whole episode, the sea represents something bad. Velma can't tolerate it. Its inhabitants are all angry with Daphne for some reason. ALL the monster attacks happened under the sea. T.D. tried to tackle something overwhelming in this, but failed; Velma still has an aversion to water, Daphne made amends with the dolphins but still has all the rest of sea-life giving her dirty looks.
The mind placates itself by giving Dream-Shaggy and Dream-Scooby tons of food while T.D. (Daphne) quickly distracts their rational mind (Fred) away from the angry, angry, sea creatures. What they represent in the mental world is anyone's guess, but it's clear that whatever it is it's not something that can be dealt with exclusively within the mind. By reconciling with the dolphins, the mind can put it behind them and not let it interfere with sorting out their brain. The Cruise Captain even says something to effect off, "A great weight has been lifted off my shoulders.", and thus can move on. Although if the ending is anything to go by, there's something more to this...
  • Grand Scam
It opens with a very nervous young man up to bat. This represents TD himself and the pressure he feels he is under, hinting at a darker piece of their psyche and self-esteem. TD decides that he'd rather be tormented by a monster than by imaginary prying eyes, which kicks off the episode's plot.
  • Daphne's fascination with the moth costume could be inspired by TD's passion for real with morale-boosting cheering and acrobats.
  • Poodle Justice
In this episode, T.D. is focused on figuring out who they are, as they continue their quest to reassemble their fragmented mind. Does Daphne's gender resonate with T.D.'s, or is her place as T.D.'s dream persona unrelated to it? To find out, T.D. tries out a beard. True, T.D. could just be a girl who decides to wear a beard in their dream, but for the sake of dream symbolism, clarity, and in remembering this is a mere WMG, let's say that the beard means something. In the end, Fred eventually reluctantly comes to terms with Daphne's beards-T.D. recognizes their waking gender as a guy, even if Daphne isn't. Fred is still unhappy about the mustache, (Because the rational mind rejects mustachioed women as, well, rational).
  • Me, Myself and AI
As T.D.'s condition grows more serious, more and more advanced equipment is required to keep them alive. T.D. is vaguely aware of various needles invading his body and overhears conversations doctors have. He's not sure what to think of this and has (Quite literally) mixed feelings. Daphne on one hand is VERY wary of all this, recognizing that something going wrong or a glitch occurring could prove lethal. Velma accepts it and the potential for keeping them alive and improving their health, and Fred outright embraces it, and is the wearer of the "Left-arm 3000".Fred's "Left-Arm 3000" isn't a new gadget. In reality, in the accident causing T.D.'s coma, his left arm got very badly injured. At this point in the coma progression, the doctors decided to try a new, experimental cast that involved placing T.D.'s arm in a clunky metal contraption that would keep his arm completely motionless to optimize the healing process. In the dream, T.D. changed this because it would simply be much cooler to wear a "Left Arm 3000" than any old cast.
  • This is also why, even when the Left Arm 3000 proves to be very dangerous and difficult to control, it never occurs to any of the characters to have Fred just take it off: T.D. can't, because he's asleep and in reality, the cast is still securely attached to him, and the sensation of it being clamped over his arm is a constant reminder.
  • In the end, there are two possibilities: A) The experimental cast didn't go as well as the doctors wanted and they took it off before it could mess up T.D.'s arm even more, or B), T.D. just became so desensitized to it that it disappeared from his dream.
  • Be Cold, Scooby-Doo!
At this point T.D. gets a fever. Now I'll say this once: Fever + Coma = Bad news. No matter what happens, he can't get warm, and so, resigning himself to the chill dreams up a winter wonderland as a fun alternative to shivering in a lonely white room. The subplot with Daphne and the snowball could represent someone (Who reminds him of Fred) whom he's frustrated with in real life. Fred constantly dodging every attempt is T.D. acknowledging that as a dream, to get any satisfaction is impossible. In the end, he decides to give himself a break and at least pretend to have some closure. Shaggy and Scooby's song is just a fever dream of T.D.'s: Weird, random, and meaningless. (But Funny).

  • Eating Crow
T.D.'s health continues to deteriorate. Daphne is portrayed as unusually desperate in this episode, expressing wistfulness for a friendship like Shaggy and Scooby's. By this point, while still unclear exactly how much time T.D. has been trapped in his state, it's clear he has gotten lonely. He just goes straight to collecting animal friends instead of creating some replicas of his friends from the outside world. Did he have friends at the point he went comatose? Daphne's sadness at the end of how could be because she's been betrayed.
  • Mysteries in the Disorient Express
    • TD is trying to remember his mother, but all he gets is Scooby imitating stereotypical old woman scenarios and trying to block out his dreaming to focus, represented by Daphne's quirk. His dreams have been gotten much more peaceful lately. However, a fellow patient dies (represented by the grim reaper being announced) the aspect of his mind that is Fred jumps onto this aspect.
  • Alternatively, each member of Mystery Inc. represents an emotion, like in Inside Out. (Daphne=Joy, Shaggy=Fear, Fred=Anger, Velma=Sadness, Scooby=...Disgust? IDK, Disgust was just leftover)
    • They must be an angry person, seeing as Fred's calling the shots. (This might not apply to Daphne, since she DOESN'T listen to him, especially not when he tries to suppress her antics. It's kinda like Anger is Joy and Joy is Sadness from the movie)

The Hex Girls will show up in a Be Cool episode.

Daphne doesn't care about Scooby, Shaggy, and Velma.
The reason Daphne is with them is that she's in love with Freddy. Do you think a preppy girl would willingly hang out with a bookworm, a hippy, and a dog all day long? She doesn't even care about solving mysteries and helping people. She's only tagging along so she can get close to Fred.
Shaggy is so stoned, he's imagining Scooby talking to him.
All the times you see Scooby-Doo talking and doing human-like things, it's all in Shaggy's head. Scooby is a regular dog. In reality, Scooby's lines are just barks and growls.

The gang can't age because of an immortality spell.
Back in 1969, an actual voodoo witch placed a spell on the gang for meddling in her business. That's why they still look young today. The sad part is, they are not aware of the spell. To them, it's still the 1960s.

The 50th anniversary direct-to-video movie(s) will feature at least one Continuity Cavalcade scene.
While there won't be Continuity Porn or an outright confirmation of what universe the 2010s-era movies takes place in (since a recurring point about these movies is that they're meant to stand on their own), there will be stronger references to previous Scooby-Doo works, such as brief cameos from past characters or hints that these characters exist in this continuity like how Mrs. Dinkley's characterization in Abracadabra-Doo! fits the bill for her being Angie Dinkley, the Crystal Cove license plate on the Mystery Machine in Frankencreepy, etc.
  • This WMG is looking to be at least partially Jossed already. We're at least getting DTV follow-ups to 13 Ghosts and Zombie Island, so those are pretty Continuity Porn heavy right there. It would also appear to have the opportunity of presenting a meta reason or establishing a sort of timeline (as if this is the case that causes them to break up BEFORE Zombie Island). Or if the movie passes with none at all, would pretty much signify the studio is just doing Rule of Fun continuity as Hanna Barbera did. There isn't much room for the MI fans' interpretation if that happens. One of the leaked scenes for Curse of the 13th Ghosts shows Daphne has a framed picture of the gang unmasking the Moat Monster from the start of Zombie Island in her room, implying at least that case happened before this one. Something that could also be relevant is the Frankencreepy Freeze-Frame Bonus had the plaid shirt tourist from Witch's Ghost, Alien Invaders, and Cyber Chase on the Scooby Gang revenge page. If those movies didn't happen yet, why was he already mad at them? So 2019 will probably be the year we can agree on this.
  • And the verdict appears to be in. The movies are in a loose HB-style continuity where they edit out whatever parts they don't want as they go along. Both 13 Ghosts and Zombie Island happened before these movies but the gang was still teens. And the setup plot from Curse of the 13th Ghost continued to Return to Zombie Island and didn't fully resolve itself yet. The 50th-anniversary present appears it might be direct to videos turning into having an actual direction.

Daphne is faking her wacky personality in "Be Cool, Scooby-Doo!"
She is aware of her bland personality, so she creates this wacky persona to get people to like her.

All of the mysteries are staged by the gang
Daphne pays her friends, relatives, and neighbors to dress up as monsters. They set up fake mysteries around the world in hopes to become rich and famous. The only things that are real are the collateral damage, cops, and bystanders. When the unmasked monsters go to jail at the end, Daphne's rich family "persuade" the cops to let them go.

Mystery Inc. Did something horrible, and their longevity is a punishment, not a gift.
Sometime around the 2000s, Mystery Inc. had a resurgence in popularity. Now, previous to this, Scooby-Doo was a dying franchise. They did something to reverse this and gained the fame and revitalization they desired...but at a cost. They will live on...watching their fellow shows die out, their fellow HB characters fade, everything they know be warped and ravaged by time. They would be revitalized...again, and again, and again...increasingly deviating from who and what they once were. The gang deals with their guilt in various ways. Shaggy and Scooby turn to food and grow increasingly frightened as a way to distract themselves from the weight of their deed. Daphne becomes more aggressive, as an outlet for her self-loathing...only Fred seems to remain a fairly blank slate because only he has no remorse for what they've done. When they learn their lesson and take responsibility for their actions, they'll break the curse and the franchise will fade. Possibly they managed this in Mystery Incorporated, as the universe is finally reset. Maybe be cool is a completely new, alternate mystery inc. Maybe. This is a WMG, after all.

Scrappy will appear in a future live-action movie as The Atoner, bailed from the pound to help with a particular case.
And it'll be shown that, even if Scooby forgives him for his past sins being the Nice Guy that he is, Scrappy is completely unwilling or unable to forgive himself. Whatever character arc he ends up going through as the movie progresses may or may not help ultimately push him in the right direction towards doing so.

Be Cool, Scooby-Doo! and the movies Take place in timelines where the Niburu Entity still influenced events after its defeat.

Shaggy and Scooby-Doo Get a clue is a comatose dream of Shaggy.
This series takes place immediately after What's new Scooby-Doo. After playing too many video games Shaggy has a life-threatening seizure and falls into a coma. The entirety of Shaggy and Scooby-Doo Get a clue is his dying dream.

Shaggy and Daphne were a couple in the 1980s.
While Freddy and Velma were away at camp, Daphne and shaggy grew closer and fell in love. After the break-up, they decided to keep their love affair a secret in fear of hurting Fred. Notice in the "Scooby-Doo and the 13th Ghost" movie she seems nervous and ashamed when Fred asked her about her past adventures.

Velma's friend/ love interest from the 2002 movie was a young Tony Stark.
Basically to me the facial hair and Led Zeppelin T-Shirt make him look like Tony to me and to my knowledge he isn't named on-screen, and even if he was it's not impossible that Tony wanted to enjoy his vacation without being harassed, so he used a fake name.

The Scooby Gang are adults pretending to be teenagers.
They all have Peter Pan Syndrome. They preferred to be called "meddling kids" because they find their adult lives dull. Freddy left his wife and kid to be with Daphne, and Daphne left her husband and kids to be with Freddy.

The next sequel will be to Reluctant Werewolf
They make a reference to it in Return to Zombie Island hinting at the possibility. If they do, I think it will likely get the Curse of the 13th ghost treatment in which Googie will appear but Scrappy won't.
The gang lives in California
In the original series, they go to beaches, mountains, ghost towns, cities, and the countryside. The only state where all of these could be a day's drive is California.
One of Shaggy's relatives was a werewolf
He was shown to be able to turn into a werewolf twice during the series. It is likely he is somehow descended from a werewolf.
  • Yes, Shaggy the first whose castle they go to in "Moonlight Madness" was also a werewolf.
The scoobyverse is in between our world and the spirit world
It would explain all the ambiguous supernatural elements including things moving on their own as well the fact that time flows it just flows differently.
The reason for Shaggy's family having a werewolf curse is that he and Scooby share a common ancestor.
It would explain why their families go back so long. They likely go back longer than what is portrayed. The curse was likely the result of an experiment gone wrong in some way.
Scrappy is Daphne's long-lost brother, from a meta-perspective.
This theory dips into both the meta-context and some in-universe. Back when the gang was created, there was a sixth member who was also present-we don't know what became of them-only their names. Geoff Jones, Linda Blake, and W.W. (whose last name is assumed to be Blake as well, since he was Linda's brother) are the only ones who share names with the present gang. So, Geoff Jones maps to Fred Jones. Linda Blake maps to Daphne. Too Much is Scooby. Kelly Summers (assuming that it's a girl Kelly) and Mike Andrews, based on gender, correspond easily. But where does W.W. fit into this? Some early concept art displays Kelly, who looked much more similar to Daphne, a young man who is the spitting image of Fred...and a boy who looks noticeably younger than the others and even shares a scarf similar to the girl on the left. He's too young to be the Shaggy analog since Shaggy was the most off-beat, grungey type. So we have a younger member of the gang who is related to someone else...Hmmm. Where have we seen this before?But in any case, W.W. Blake must have been cut, because Daphne remains an only child for the next forty years or so (and even then, it's three sisters who are all older than her)And this is where Scrappy comes in. Scrappy is not literally Daphne's long-lost brother, that would be...unkosher.Enter Scrappy. Scrappy took his cues as both from an early concept of a smaller, feistier dog as well, but Daphne, especially in later series, takes on a big-sister role. In-Universe, maybe Daphne really did have a brother named W.W. who died, (and nobody ever talks about him because it's too painful) and was reincarnated into Scrappy. Daphne was stunned at how much Scooby's nephew reminded her of her kid brother, and connected to him easily.Scrappy likewise recognizes his former sister on some level, often displaying caring for her that goes beyond histypical eager beaver behavior or even a Precocious Crush.
Mystery Inc. isn't allowed to talk about Scrappy
Alternatively, if they must talk about him, they're forced to do it in the form of insults.
There are multiple Scooby-Doo universes
The Mystery Inc. gang from Zombie Island up to the present day aren't the same crew from the 1960s-1990s. It would explain why modern-day Fred and Velma are not familiar with Scrappy-Doo. The mid-2000s TV shows exist in different universes. They're not in canon with the movies.
  • Confirmed in the final issue of Scooby-Doo Team-Up.
Fred and Daphne can never become a couple
As much as people want to see them together, it will never happen. Even if they are attracted to each other, things must return to the status quo. The characters can never evolve. Shaggy and Scooby would be less funny if they got over their fear of monsters and ghosts. Everyone's personality must stay the same for comedy.
Scooby-Doo is not a Great Dane
A pure Great Dane, that is. He's a Great Shepherd or a cross between a German Shepherd and a Great Dane. Several real Great Shepherds have brown-toned coats with spots and half-upright ears, just like Scooby-Doo.