When his girlfriend's younger sister comes to town, Eric asks Shawn on a double-date instead of Cory, which makes Cory decide to get a new image as a "bad boy".

Cory feels uncomfortably domesticated, having been with Topanga for so long. So he misses a date with her to go to a school party with Shawn and the guys. However, Cory finds out that she is at the party, disguised as a French student.