Finn takes up a quest from a dying knight to protect three magic beans: two good, one evil. But when he and Jake decide to plant the beans to eliminate the evil once and for all, will they be able to figure out which is which in time?

Finn, who has to give a speech at Princess Bubblegum's science barbecue, seeks a quick fix to make himself smarter. However, he does so by getting a pair of glasses with very strange effects.