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 4 · Episode 34 ·
Chicken Scratch
Dexter catches the chicken pox, and Dee Dee tells him a ridiculous tale that if he keeps scratching them, he will turn into an evil chicken. His nonstop scratching eventually does just that.
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Episode 34 of season 4 of Dexter's Laboratory: “Chicken Scratch”. Aired 2003-11-04. Watch it online free on ZapFlix.