1x36 - The Super Mario Bros. Super Show!

The Trojan Koopa 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. Texas Tea The Marios strike oil and come to the conclusion that they'll become millionares.