Dexter's Laboratory
Dexter, a boy-genius with a secret laboratory, constantly battles his sister Dee Dee, who always gains access despite his best efforts to keep her out, as well as his arch-rival and neighbor, Mandark.

Season 2 · Episode 81 ·
Trick or Treehouse
Dee Dee builds a treehouse in the garden and Dexter can't stop wondering what's up there.
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Episode 81 of season 2 of Dexter's Laboratory: “Trick or Treehouse”. Aired 1998-03-04. Watch it online free on ZapFlix.