Klaus enlists Stan, Roger and Jeff to join him on a wild bachelor party weekend.

When Principal Lewis threatens to cancel science club, Steve takes matters into his own hands in a monstrous way.

Francine's newfound friendship with a frog brings excitement to the whole Smith household. Unfortunately, it drives their neighbor, Greg, crazy.

When Stan discovers anonymous love letters written to Francine, he worries that this secret admirer could threaten their relationship.

After a nearly fatal interaction with one of Roger's personas, Steve and Stan work together to uncover the persona's mysterious past. Meanwhile, Jeff, Hayley and Francine explore new hobbies.