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  1. Dexter's Rival; Simion; Old Man Dexter

    Dexter's Rival; Simion; Old Man Dexter

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  1. Simion is a minor villain in the Dexter's Laboratory segment Dial M for Monkey. He only appeared in the titular episode of the same name. Simion was voiced by Maurice LaMarche.

  2. Dexter's Rival/Dial M for Monkey: Simion/Old Man Dexter. 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.

    • (237)
    • 1996-04-07
    • Animation, Short, Adventure
    • 22
  3. Sep 9, 2022 · Dexter's Rival: Mandark Astronomanov (Eddie Deezen), a new student at Dexter's grade school, seems to be superior to Dexter academically. Mandark compels Dexter to shut down his lab so that Mandark's lab can gain more power.

  4. Dexter's Laboratory | FULL EPISODE: Dial M for Monkey: Simion | Cartoon Network Classics. Subscribe to the Cartoon Network Classics YouTube channel and watch full episodes of the awesome...

  5. Dexter's Rival: Mandark Astronomanov (Eddie Deezen), a new student at Dexter's grade school, seems to be superior to Dexter academically. Mandark compels Dexter to shut down his lab so that Mandark's lab can gain more power.

  6. Oct 17, 2012 · The new kid in school, Mandark, steals Dexter's spotlight and his ego when he finds Mandark has a bigger and better Laboratory.

    • 45 sec
    • 98.7K
    • CartoonNetworkEps
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  8. May 12, 1996 · Dexter regains his status when he helps Mandark invite Dee Dee, the most destructive force known to any Laboratory, over for a date. / "Simion": Seeking revenge on Mankind, a super-transformed space chimp, Simion attempts to get Monkey to help him destroy the Human Race.

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