Mario and Luigi help a certain Mark Twang win a riverboat race against Koopa. Featured Song: Proud Mary (Creedence Clearwater Revival) Dr. Frankenstein asks Mario and Luigi to help him with his experiment in promising his monster a normal brain. While laying down to take a nap, Mario gets caught up in the experiment and his brain gets switched with the monster's.
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Performed by John Fogerty
Original airing and UK DVD only See more