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 3 · Episode 9 ·
The Grand Daddy of All Inventions
Dexter's mom takes him to his grandpa's house. At first he thinks it's going to be a boring day until he discovers that his grandpa has a secret lab!
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Episode 9 of season 3 of Dexter's Laboratory: “The Grand Daddy of All Inventions”. Aired 2001-11-30. Watch it online free on ZapFlix.