Jack must perform a heroic deed by Monday, or flunk out of fairy tale school, just like his father before him. To succeed, Jack sells his C.O.W. (Computer of Wonder) for a handful of beans that, overnight, magically grow into a gigantic beanstalk reaching high into the sky. Desperate to be a hero, Jack climbs up the enchanted beanstalk into a magical and dangerous world, and with the help of some friends he learns the true meaning of heroism on his adventure.