Dexter's Laboratory Dexter's Rival/Dial M for Monkey: Simion/Old Man Dexter (Season 1, Episode 3)
TV-G
TV Episode | 22 min | Animation, Short, Adventure

Primary photo for Dexter's Rival/Dial M for Monkey: Simion/Old Man Dexter

Dexter's Laboratory

Dexter's Rival/Dial M for Monkey: Simion/Old Man Dexter (Season 1, Episode 3)

TV-G

TV Episode | 22 min | Animation, Short, Adventure

Boy genius Dexter wants to stay up and watch the 8 o'clock movie with his family, but his mother says he's not old enough. Using one of his inventions makes himself older, but maybe he's made himself a little too old.

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Cast	+ Add Cast
10 cast members

Name	Known for
Christine Cavanaugh Dexter (voice) Dexter (voice) See fewer	Dexter's Laboratory (1996)
Allison Moore Dee Dee (voice) Dee Dee (voice) See fewer	Dexter's Laboratory (1996)
Eddie Deezen Mandark (voice) Mandark (voice) See fewer	WarGames (1983)
Jeff Bennett Dad / TV Announcer / Old Man Dexter (voice) Dad / TV Announcer / Old Man Dexter (voice) See fewer	Enchanted (2007)
Frank Welker Teacher #2 / Principal / Robot / Monkey / Captain (voice) Teacher #2 / Principal / Robot / Monkey / Captain (voice) See fewer	Transformers: Dark of the Moon (2011)
Kath Soucie Mom / Teacher #1 / Computer / Worm (voice) Mom / Teacher #1 / Computer / Worm (voice) See fewer	Rugrats (2021)
Mako Main Title Narrator (voice) Main Title Narrator (voice) See fewer	Conan the Barbarian (1982)
Maurice LaMarche Simion (voice) Simion (voice) See fewer	Futurama (1999)
Robert Ridgely Commander (voice) (as Bob Ridgley) Commander (voice) (as Bob Ridgley) See fewer	Boogie Nights (1997)
Paula Tiso Honeydew (voice) Honeydew (voice) See fewer	Final Fantasy X (2001)