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 17 ·
Lab of The Lost
Dexter ends up in the "old part of the lab" where his earliest inventions, long since forgotten, are not too happy to see him. They are mad at him for saying they were his greatest inventions, then moved on to another great invention.
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Episode 17 of season 2 of Dexter's Laboratory: “Lab of The Lost”. Aired 1997-08-20. Watch it online free on ZapFlix.