Dee Dee Be Deep is the first part of the 17th episode in season 2 of Dexter's Laboratory. It originally aired on November 5, 1997. In this episode, Dee Dee wants to try out for the Singing Minors Choir, but Dexter plans to put a stop to her horrible singing.
Dexter is in his lab preparing to screw in the last bolt using his flathead screwdriver. Suddenly, he is disrupted Dee Dee's loud singing. Dexter throws the screwdriver on the floor in frustration and then proceeds to cover his ears. Computer shows him where the source of the noise is coming from and Dexter heads off to Dee Dee's room
Dexter: I cannot complete my creation under such circumstances!
Dee Dee: (faintly) ♪ Is worse... (so loudly it blows Dexter towards the banister, which he holds onto) THAN A THIEF/ON TOP OF OLD SMOKEY ♪
Dexter: DEE DEE!
Dee Dee: ♪ ALL COVERED WITH SNO-O-OW/I LOST MY TRUE LOVER/BY COURT-- ♪
Dexter: DEE DEE! DEE DEE! DEEEEE DEEEEE!
Dee Dee: *clears throat*
Dee Dee: ♪ What's with all the noise, Dexter? ♪
Dexter: Dee Dee, I am mere moments away from completing my greatest invention to date, and I cannot concentrate with all this noise. (whispering) So I will have to ask you to... (shouting) CUT OUT THE DAD-GUM SINGING!!!
Dee Dee: ♪ No-so! Pooh on you! ♪
In the credits, Lisa is simply referred to as the "Little Girl".
The Barbershop Singers are a reference to the classic Barbershop Quartets of the late 19th century and early 20th century who were especially common in Vaudeville acts.
Lisa is likely based on legendary child star, Shirley Temple.