Rolling Down the River (Cartoon)\rbrThe Mario Monster Mash (Live Action)\rbr\rbrMario and Luigi help a certain Mark Twang win a riverboat race against Koopa and save Princess Toadstool and Toad who were kidnapped. \rbr\rbrDr. 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 monsters.