The Super Mario Bros. Super Show!

The Trojan Koopa (1x36)

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Koopa's kidnapped Princess, and Mario, Luigi, and Toad try to rescue her, failing numerous times. Mario realizes that Koopa's ego is his weakspot, so they use a Trojan Koopa (instead of a horse) to break into his fortress. However, it all doesn't go as planned, and they find themselves surrounded by Koopa's guards.