The Lab of Tomorrow is the first part of the 12nd aired and 11st produced episode in season 4 of Dexter's Laboratory, which first aired on November 4, 2003. The episode features Monkey as he gives a documentary of what future laboratories and sciences will be like.
In this episode it was revealed that Monkey could talk; originally, his first language was typical monkey screeches.
It was revealed that the narrations were Monkey talking, but when Mandark walked past him, his mouth was not seen moving and the narrator was heard speaking.
This episode is a parody of Tex Avery's "...Of Tomorrow" series ("The House of Tomorrow", "The Farm of Tomorrow", "Television of Tomorrow" and "Cars of Tomorrow").
Although "The Lab of Tomorrow" and "Garage Sale" aired on November 4, 2003, they were actually made in same year in the credits. According to the credits, the animated short made in 2002 "Chicken Scratch" is re-released on November 4, 2003.