Dee Dee is a Yaoi Fangirl and is/was reaching puberty.Remember "Jeepers Creepers Where Is Peepers"? The episode in which Dexter and Dee Dee imaginary friend Koosie must save Peepers from some Generic Doomsday Villain? http://villains.wikia.com/wiki/Hookocho That Villain is Bishonen, Dude Looks Like a Lady, and a Walking Shirtless Scene, and basically, he's in Dee Dee's mind. Dont forget what's on his penis. And the fact that, if he destroy Dee Dee's mind/imagination, Dee Dee will no longer be a child. Does This Remind You of Anything??
Regarding the show's incestuous subtext.Even for an older sister, Dee Dee is rather... attached to her baby brother. She's very touchy-feely, tries to distract Dexter from his work all the time, and gets upset when Dexter ignores her. He's the only character she treats this way, and it evokes a girl who's too into her love interest. The creators of the show probably wanted a kind of reclusive guy, extrovert girl plot...except that Dexter would be too aloof and preoccupied to catch on to her advances. In the end, they decided to just make the two siblings, probably to explain how she's always at his house if he doesn't like her much. But they kept the trappings of a one-sided romance.
DeeDee is Eris from The Grim Adventures of Billy & Mandy.A younger form? An avatar? A daughter? A herald? Whatever she is, there's nothing better to disrupt the delicate machinations of science and technology than the divine powers of chaos and discord. If she grows up to be a total babe with an accent as inexplicable as her brother's, well... no surprise here.
DeeDee is not Dexter's sister, but his future daughter.Some time in the future, Dexter has a daughter but also creates an invention which threatens the world. DeeDee is sent back in time to prevent this from happening by pretending to be his sister and destroying his inventions that could set up her future. She can get into Dexter's lab no matter what protections he puts on it because, to her, they've always been there; she knows how to bypass them. And DeeDee is a codename, literally standing for 'Dexter's Daughter'.
Dexter is Dexter from Dexter.What? He hates people, is super smart, and has an oblivious sister. It makes everything slightly less confusing.
Dexter's Lab is the prequel to The Big Bang Theory.This says it all
Dexter is a leprechaun, or a Half-Leprechaun.He's short, red-haired, and does things that defy the laws of physics. Oh sure, he calls it "science," but he never once employs the scientific method. His uncle uses real magic and is clearly Irish.
Deedee's smarter than she's letting on.
Deedee is cosmically aware.This kinda makes her a bit of a jerkass because she knows exactly what Dexter or anyone else means or is trying to do and still goes out of her way to be the ditz.
Dexter is a Son of Ether.Seriously? Why is this even a theory. Unless magic was involved, I seriously doubt any of the stuff Dexter builds could have been built by a 8-10 year old.
The nut Dexter's often seen turning indefinitely is a wind-up system to power up his lab.He designed a huge, complicated power generator that would be able to provide days' worth of energy for his gigantic lab by expanding the energy generated by that simple turning motion.
Dexter's dad is who Owen is during his off timeThat means that Dexter's Dad is one of the Children of Oberon...which actually explains a lot about Dee Dee and Dexter.
Dexter becomes the Professor from Jump Start 3rd GradeAnd Polly is his daughter. They do kind of look alike...
Dexter's family name is DexterThis is why they call themselves the Dexter family.
Dexter is living in a projection of his insecurities.Dexter, in reality, gets terrible grades in school and is not very bright. He envies the students that do well, and has grown jealous of them. This is why much of what he says is random technobabble, the amount of Cow Tools in his lab, and why none of his experiments seem to have any purpose other than BEING "scientific things": It's all in his head. Dee Dee is actually an Honors student, and because of Dexter's jealousy, she appears in his fantasies as an idiot. Mandark is the head of Dexter's class, and as such, gets the role of Dexter's rival. Mandark's lab is what Dexter really imagines him to have.
Dexter goes on to work at Black MesaAfter moving out of his house to perform his experiments away from Dee-Dee's meddling, Dexter realizes he has to change his name to escape the stigma attached to his old one that came about as a result of his lab being exposed to the public. He changes his name to Gordon, after his favorite show, Flash Gordon, and changes his last name to Freeman because he will finally be a Free Man. To further mask his appearance, he also dies his hair a darker shade of red/Brown and grows a goatee. Using money made from Do D contracts at his existing lab, he attends MIT (Being unable to attend harvard for reasons that would later become a Mystery to everyone, even those involved. After Graduating, he moves to New Mexico and seeks out occupation, eventually settling for a laboratory not unlike the one he owned as a child]]... The rest is history.
Dexter is Calvin.Except he's an alternate universe version, in which he embraced science instead of just his imagination. Think about it: both of them are very intelligent children, and are highly imaginative - it takes some serious imagination to invent some of the stuff Dexter creates. Calvin invented a thing or two, as well (the Transmogrifier, for example) but lacked the resources to make it truly real. They both have non-human companions who they trust and look to for advice above anyone else (Hobbes and the Computer). And, both Calvin's and Dexter's parents are nigh oblivious about what their sons get up to when they're alone.
Deedee has a form of epilepsy that causes her to destroy laboratories
Mandark moves to DimmsdaleAfter turning his mom from a hippie to a gangster wannabe, Mandark decided he wold punish himself. He moved to a small town named Dimmsdale. He changed his name to Denzel because no adult man wold want to go through life with the name Susan. And he chaged his last name too Crocker because his old last name Astronominov was too hard to pronounce. Then he went to work at Dimmsdale Elementary School. Then he gets ready for a life unlike the one he had as a 16 year old.
Dexter will work for the SCP Foundation in the future
Dexter has Asperger's SyndromeThis troper has it, and she sees aspects of it in him.
Dexter and Mandark both have a vague mental disorder that's connected to their intelligence.I can't think of a another reason why else these two boys sound vaguely foreign but have American parents. With Dexter, he sounds like a kid doing a bad/childish Austrian accent, while Mandark's could really be anything. Hell, I thought Mandark actually WAS foreign, with him looking Chinese(ish) while his sister had some sort of Mongolian look to her. This is completely thrown out the window when we finally see their parents and they happen to be completely white. (Seemingly, anyways.) It could be that Craig McCracken intended for him to be asian, but the new production team had different ideas. Whatever idea the case maybe, it reminds me of this disorder: http://en.wikipedia.org/wiki/Foreign_accent_syndrome
Most of the episodes of the series take place in a simulation designed by Dexter to determine everything that might go wrong with his laboratory before he gets too far into building it.This explains the Negative Continuity as well as why Dexter, who's supposed to be a genius, keeps messing up. He's doing it on purpose to test his future lab.
Mandark is a Hero AntagonistWe're just seeing things from Dexter's point of view.
"Dee-Dee's Room" is just a nightmare of Dexter'sThat episode is surreal even by Dexter's Lab standards.
Dexter moved up a grade or twoEverybody in his class looks older than him, and he is a super-genius after all.
Seasons 3 and 4 are an Alternate ContinuityThere are just so many retcons this has to be true.
Dexter's accent is fakeDexter's family seems pretty All-American, and he's the only one with an accent. This is because he saw geniuses on TV and thought that all geniuses had accents. Also, this further helped to differentiate him from his family, who are idiots when compared to him. So he faked his accent until it became natural.
Dexter is also running a Meth LaboratoryAnd the one reason why Deedee keeps going inside the Lab and breaking Dexter's machines is to find the Meth.
Dexter is somehow the final regeneration of the Doctor
Dee Dee's name is not "Dee Dee"It's a nickname.
The lab isn't actually inside the house.It's located somewhere else and connected to Dexter's room via portal technology.
Dexter is asthmatic.Think of it. During the VERY first episode, Dexter started to cough, and then used an inhaler.
The secret password to get into Mandark's laboratory is...Ha Ha Ha Haha Haha Ha! Ha Ha Ha Haha Haha Ha!
Dexter's parent's are not his biological parent'sHe was accidentaly Switched at Birth. His biological parents are Hugh and Lila Test, also Susan and Mary are his sisters that means that Dee Dee's real brother is Johnny
Dee Dee is smarter than Dexter.In the intro, you see Dee Dee roll her eyes and plug in the machine. That might seem minor, but in another episode, you see her hit buttons on Computer until she tells Dee Dee where Dexter is, and then she goes to rescue her brother. And when he insults her, she sends his pathetic ass back. My theory is every machine she destroys is either one that will malfunction horribly and/or one that will shatter the masquerade. So why does she hide it? Dee Dee is more socially adept, more athletic, and more popular. If Dexter knew she was also smarter than he was, he'd hate her. And nobody likes being hated. So she hides her intelligence to keep a relationship with her brother.