Dexter's Laboratory Wiki
The Big Sister "The Big Sister" Premiere Order
"Old Man Dexter"
"Dimwit Dexter" Dimwit Dexter
The Big Sister "The Big Sister" Production Order
"Old Man Dexter"
"Dimwit Dexter" Dimwit Dexter
Old Man Dexter
Season 1, Episode 003 / 3c
Episode name reference to/pun on: None
Old Man Dexter Title Card
Air date March 24, 1996 (first airing)
May 11, 1996 (TNT)
May 12, 1996 (second airing)
Production number 003 (pilot)
Directed by Craig McCracken
Genndy Tartakovsky

Old Man Dexter is the third pilot episode of Dexter's Laboratory. It originally aired on March 24, 1996 as part of World Premiere Toons, and later re-aired on May 12, 1996 as the third segment of the third episode of season one.

In this episode, Dexter is forbidden from staying up late with Mom, Dad, and Dee Dee to watch a late-night film since he is young. Using the Hydro-Cosmetic Accelerator, Dexter tries to accelerate his age into a young man. However, Dee Dee's meddling causes Dexter to transform into a 95-year-old man.


On Saturday night, the Dexter family gathers in the living room to watch the film Santa Claus vs. The Wolfman. Dexter jumps in eager to watch, but Mom tells him he's not allowed to stay up until he's older. Disappointed, Dexter retreats to his bedroom. Next Saturday night, Dexter begs Mom to let him stay up, but she declines. He asks Dad, but gets no response.

On the third Saturday night, Dexter crawls to the living room to watch TV, but Mom sends him to bed. As Dexter climbs the stairs, he watches Mom, Dad, and Dee Dee laugh at the TV program from the handrail. Mom's words ring into Dexter's mind, giving him an idea. On the fourth Saturday morning, Dexter goes into his lab and heads to his invention, the Hydro-Cosmetic Accelerator, to transform himself into a 21-year-old man. As he steps inside, Dee Dee enters the lab and presses a button on the Hydro-Cosmetic Accelerator's keyboard. Just after, Dexter steps out appearing as an elderly man instead of a young man. Mom calls Dexter and Dee Dee down for lunch, to which Dee Dee eagerly races out of Dexter's room. Dexter goes down the stairs very slowly.

That night, the Dexter family meets in the kitchen for dinner. While Mom, Dad, and Dee Dee eat steaks, Dexter is given applesauce with some antibiotics. Having trouble trying to eat, Dee Dee takes Dexter's applesauce, puts it in an I.V. drip, and injects the needle into Dexter's arm. At 8:00, Dad, Mom, and Dee Dee race to the living room to watch The Late Early Movie, knocking Dexter over in the process. In the living room, Dexter asks Dad to pass the bowl of popcorn to him. When the bowl gets to Dee Dee, she passes it to Dexter, but gets no response as Dexter has fallen asleep. Thinking that Dexter "died", Dee Dee starts crying, only for Mom to tell her that Dexter is too old to stay awake.



  • Running gag: Dee Dee calling Dexter "Grandpa" due to his elderly appearance.
  • This is Dad's first physical appearance. He did appear in the episode "Changes" in a photo.

Production Notes[]

  • This is the third pilot of Dexter's Laboratory. It was the only pilot that didn't air in "What a Cartoon!".
  • This episode aired twice in the series with the first being the pilot.
  • This episode with "Dexter's Rival" and "Dial M for Monkey: Simion" were produced in the same year of 1996 according to the credits.