The Super Mario Bros. Super Show!
Koopenstein still
S01E2622 min· aired 10/9/1989

Koopenstein

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Overview

Dr. Koopenstein starts the trouble by trying to steal the Marios' brains for his new invention, and then he really turns into a monster.

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S01E25
Sing for the Unicorn
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S01E27
On Her Majesty's Sewer Service