The third episode of Dexter's Laboratory aired on Cartoon Network on May 12, 1996.

Dexter's Rival

Dexter discovers he has a rival with a bigger laboratory---Mandark. He then teams up with DeeDee to stop him.

Dial M for Monkey: Simian

Monkey faces an evil chimpanzee named Simian, who plans to take revenge on humanity.

Old Man Dexter

After Dexter is banned from watching a movie, he devises a plan to accelerate the aging process, but DeeDee's tampering causes Dexter to turn into a 95-year-old.

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