April 14, 1996 (first airing) May 26, 1996 (second airing)
Craig McCracken and Paul Rudish
Creator, writer, and director:
Dimwit Dexter (originally called Dumb Like Dee Dee) is the fourth pilot episode of Dexter's Laboratory. It first aired on April 14, 1996 and later re-aired on May 26, 1996 as part of the third part of episode 5 in season 1. In this episode, Dexter's brain shuts down as a result of him overworking, which leads to him behaving erratically and being the butt of jokes among Dee Dee and the entire neighborhood.
The episode starts with Dexter in his laboratory working on his latest invention. He is stressed to the point where his brain eventually shuts down. Afterwards, Dexter starts acting dumb and committing unusual acts such as dropping a rat into a filled beaker, eating a green substance, and repeatedly failling down the stairs. Dee Dee eventually witnesses his odd behavior and takes advantage.
In Dee Dee’s room, Dexter is seen in a dress and going by the name of “Ginger.” Dexter is unfazed and continues is odd behavior, eventually making is way outside. He then proceeds to strip down to his underwear, also gathering the attention of the neighborhood kids.
As the neighborhood kids along with Dee Dee become amused, Dexter is seen performing more unusual acts including jumping into a mud puddle head first, filling himself to maximum capacity with a garden hose, taking a goldfish and putting it down his underwear, and dancing weirdly.
The kids then gather around to watch Dexter as he prepares to kiss a duck’s rear end. He eventually snaps out of his delusion, regaining himself even noticing what he’s done. He runs away in horror. The episode ends with a confused Dexter still holding the duck in his hands, which proceeds to kiss him back and blink romantically at him.
When this episode aired on The Cartoon Cartoon Show, the Cartoon Cartoons theme played over the title card instead of the original music.
This episode was originally named "Dumb Like Dee Dee".