Mandark Astronomanov, a new student at Dexter’s school, seems to be superior to Dexter academically. Mandark forces Dexter to shut down his lab so that Mandark’s lab can gain more power. However, with the help of Dee Dee, Dexter manages to destroy Mandark’s lab.

Again tired of being short, but mindful of his past failures, Dexter decides to make everyone shorter than himself.

Dexter thinks that a crazy homeless person balancing electronic devices on his head and muttering gibberish is a genius trying to contact aliens, so he takes him home.

When Dexter’s computer gets laryngitis, Dexter must find a replacement voice.

Rerun of “Dexter’s Laboratory”, the first What a Cartoon! pilot.

Dee Dee uses Dexter’s growth formula on the plants in the garden, which causes them to grow to an enormous size……and man-eating monsters as well.

Dexter and Dee Dee compete against each other on a game show.