The Last Laugh
S01E15 - Airdate: 1992-09-22
Runtime: 30 min
Joker creates a toxin that affects only fish, mutating them into Joker fish. Then, he targets innocent men who refuse to copyright his Joker fish. The Joker also captures Harvey Bullock, and Batman must rescue him and foil the Clown Prince of Crime's insane scheme.
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Episode details and rating from TVmaze.