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 12 ·
Dee Dee Locks and the Ness Monster
Dee Dee Locks and the Ness Monster—Dexter's mother forces Dexter to read to Dee Dee when she's sick, but she makes up her own story after being bored by Dexter's story (which was actually a science article). The story is completely mixed up and makes no sense. Dexter ends up catching Dee Dee's illness.
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Episode 12 of season 2 of Dexter's Laboratory: “Dee Dee Locks and the Ness Monster”. Aired 1997-08-13. Watch it online free on ZapFlix.