| Main characters: Dexter / Number 12 / Action Dexter / Old Man Dexter • Dee Dee / Old Gal Dee Dee • Mom • Dad • Monkey • Major Glory • Quadraplex T-3000 Computer • Dog • Mandark / Executive Mandark / Overlord Mandark / Braindark • Oceanbird • Windbear • Douglas E. Mordecai III • Koosalagoopagoop • Pony Puff Princess • Action Hank • Lee Lee • Mee Mee • Phillips Luzinsky • Quackor • Puppet Pals
Other characters: Badaxtra • Boy Band Virus • Buzzard • Cap'n Ahab • Wet Willie • Captain of Chubby Cheese's • Chubby Helpers • Cindy • Claw • Crazy Robot • Darbie Collectors • Detention Warden • Dodge Ball Bullies • Quackor the Fowl • Doo Dee • Dynomutt X-90 • Earl • Energy Thief • Fishing Rivals • Fishy • Gary • Becky & Gwen • Gooey Aliens • Gork • Gym Teacher • Human Dissecting Aliens • Hookocho • Ice Cream Man • Inter-Dimensional Monster • Jeff • JoJo • Lalavava • Major Glory Gang • Master Computer • Mat Parallax • Principal • Mom's Rival • Ms. L • Paper Ninjas • Perfect Pony • Prison Warden • Red-Eye • The Robber • Rude Dee Dee • Rude Dexter • Shoe Gnomes • The Yard • Ultrabot 2000 • Ultrabot 4000 Observation Units • Yani • Yani's wife • Arnie • Barney Rubble (cameo) • Betty Rubble (cameo) • Big Daddy Fat • Billy Bloomberg • Blue Falcon (crossover) • Cat • Charlie • Chris • Chubby Cheese • Computress • Creepy Eyed Girl • Creepy Neighborhood Boy • Dick McMann • Dexter's Friends • Dextamina • Dextor • Dextor's parents • Dynomutt (crossover) • Eccentric Man • Fergle O'Reilly • Grandpa • Jimmy Smith • Jurassic Pooch • Katka • Lisa • Lucky & Pierre • Mailman Mel • Mar-10, Fred and Tiny • Mary Weather • Midge • Mike • Miss Wimple • Mr. Chau • Miss Pimmerwikle • NASA • Neighbor Lady • Ness Monster • Old Man McCowsky • Philian Poppyseed • Professor Hawk • Professor Hawk's Fans • Professor Williams • Replacement Sisters • Santa Claus • Soyen Chen • Surfer Boy • Talking Dog • Talking Dog's Owner • Tattoo • Tiki God • Timmy • Toshi • Trevor Winkle • Miss Salinger • Koosalagoopagoop
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