When Dexter creates a new invention to get DeeDee's rudeness under control, her foolish antics cause both her and Dexter to end up in the machine, resulting in them becoming polite, and their rude, evil counterparts being made. Now, the polite Dexter and DeeDee must find a way to rid of the disrespectful clones of themselves before they cause even more trouble.
"D & DD" Dee Dee wants to play Monsters & Mazes with Dexter and his friends. Against Dexter's wishes, she is made the game master! Dexter is relegated to a secondary character, but his friends have a great time in Dee Dee's world. "Ham Hocks n' Arm Locks" While on a road trip, car trouble forces Dexter and his family to pull into a truck stop. When Earl, a local arm wrestling champ, gets Dad angry, they decide to have an arm wrestling contest. Knowing Dad has no chance of winning, Dexter comes up with a technological way to make Dad stronger.
"Filet of Soul": Dexter and Dee Dee are haunted by the ghost of a dead goldfish. "Golden Diskette": Dexter obsessed with finding a golden diskette to get a unprecedented tour of an eccentric inventor's mysterious factory.
In "A HARD DAY'S DAY", every day is a fine day for science until things take a turn for the worse thanks to the position of the stars in the sky. In "ROAD RASH", Dexter's mom forces Dexter to go outside and ride a bike, with Dee Dee challenging him to catch her on her roller blades, resulting in a chase similar to one between Wile E. Coyote and the Road Runner. In "OCEAN COMMOTION", on a visit to the beach, Dee Dee (dressed in a mermaid bathing suit) gets kidnapped by some manic seafarin' sailors and Dexter vows to save her.
When Dexter is harassed by two bullies and forced to go into the back of a school bus chasing his #2 writing implement, he must brave the legend of little Billy Blumberg who disappeared back there years ago.
In "STAR CHECK UNCONVENTIONAL", Dexter and two friends are on their way to the Star Check convention, only to not wind up exactly where they wanted. In "DEXTER IS DIRTY", Dexter will do anything to avoid bathing forever... even laminate himself. In "ICE CREAM SCREAM", Dexter tries to get the ice cream vendor to stop to allow him to get some ice cream, but the vendor isn't too keen on doing that.
It's picture day at school and Dexter must face the truth: he is not photogenic. Using Dee Dee's Teen magazine as a guide for restructuring his physical appearance, Dexter becomes grotesquely handsome.
"Sister Mom": Dexter is so worried about something bad he did at school that, when his mother is called on it, he has Dee Dee turned into their mother instead. "The Laughing": Dexter is accidentally bitten by a clown and turns into one himself at night.
Mandark and Dexter battle each other with Rushmore Presidents Washington and Lincoln brought to life. / Dexter has a metal eating termite named Timmy as a pet. / Dee Dee uses way too much of Dexter's super growth formula in the backyard and turns the plants into man eating monsters.
When Dexter returns a little girl's stuffed bunny to her, she falls in love with him. She is soon stalking Dexter. With the help of Dee Dee, Dexter is eventually able to divert the girl's affections toward another little boy.
Dexter and Dee Dee are unknowingly the focus of a "Wild Kingdom" type animal documentary. During Dexter's bathing ritual, he realizes he's being observed, runs, gets tranquilized, and upon awakening discovers he's been tagged.