The Super Mario Bros. Super Show!

Mario and the Beanstalk (1x7)

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Desperate for cash, the Marios trade the royal cow for bean seeds. Princess scolds them, and accidentally sneezes, blowing the beans into the yard. Overnight, they grow into a beanstalk. The next morning, Mario and Co climb the beanstalk, which takes them to a gigantic castle in the sky, which is occupied by Koopa, who's now giant-sized.