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 26 ·
Bygone Errors
This takes place in the future, where Old Man Dexter tells about his ""glory days"". And Old lady Dee Dee keeps on adding her opinions as well...
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Episode 26 of season 4 of Dexter's Laboratory: “Bygone Errors”. Aired 2003-09-12. Watch it online free on ZapFlix.