When Alvin catches Simon taking a personality test to discover his soul-mate, he decides to do the same and prove just how silly the test really is. But when the test reveals that his own soul-mate is Brittany, Alvin decides to do something dramatic!

Simon is ecstatic when he's elected as the school's safety monitor. But when Alvin goofs off at school, Simon faces a moral dilemma, and has to choose between doing the right thing or giving Alvin detention and ruining the family vacation.