S1, E3: "Dexter's Rival":  The new kid in school, Mandark, steals Dexter's spotlight and his ego when he finds Mandark has a bigger and better Laboratory. Dexter regains his status when he helps Mandark invite Dee Dee, the most destructive force known to any Laboratory, over for a date. / "Simion": Seeking revenge on Mankind, a super-transformed space chimp, Simion attempts to get Monkey to help him destroy the Human Race. Monkey finds a common bond with Simion and is able to stop the evil plan by reminding him of the good-life of being a simple chimp. / "Old Man Dexter":  Dexter, tired of not being old enough to stay up for the late movie on TV, uses his Excellerager to make himself older. When Dee Dee messes up the mechanics and Dexter turns into an old man, Old Man Dexter is far too tired to stay up for the movie.