A boy named Timmy Turner ends up receiving two wish granting fairy godparents named Cosmo and Wanda, and he uses them to help him get even with his evil babysitter, Vicky.

Having been left alone with a demanding, "injured" Vicky babysitting him and using him as a servant, Timmy wishes up a bunch of clones to do his chores for him. However, when they scare Vicky out of her mind and chaos ensues, Timmy must wish them away.

Cosmo and Wanda have caught the fairy flu and whenever they sneeze, their magic effects everything around them. This is problem trouble for Timmy, who has been invited to a birthday party for Tootie, Vicky's younger sister. Tootie, unlike her sister, is madly in love with Timmy, worsening the situation.

Cosmo and Wanda try to help Timmy capture Bigfoot to earn his Squirrel Scout badge in capturing a mythical creature.