On Friday the 13th, Anti-Fairies cause trouble.

Timmy has a rough day without his godparents by missing the bus to school, getting soaked in rain, and hit by volleyballs in gym class. Being jealous at his godparents for their wonderful lifestyle, Timmy becomes a fairy godparent while Cosmo and Wanda become ordinary children. However, Timmy finds out that being a godparent takes more responsibility.