After C.J. discovers that Cate may be starting a relationship with Principal Gibb, he blabs it to Bridget. An angry Cate has Gibb put C.J. in charge of the student detention on Ditch Day, and C.J. gets even by detaining Bridget. Because she is stuck in detention and can't complete the Ditch Day prank herself, Bridget convinces Kerry and Rory to steal the rival school's mascot.
