Tales From the Cryptkeeper 2x12

Hunky, self-involved Chuck and his homely brother, Melvin, pay a visit to the ominous trader, who offers them a bag of magic beans in trade for Chuck's beloved, trusty steed. As expected, a beanstalk grows and the siblings intend to loot the castle in the clouds... but they soon find themselves trying to escape the wrath of a giant, cyclops Beanstalker.