A mysterious epidemic has spread throughout the school, with many of the athletes from the snobbish, abusive squash team falling into inexplicable and unending sleep.

It is revealed that Kiera is responsible for these events: frustrated by the lack of support from the unsympathetic school staff regarding her bullying, she has been taking revenge by leading the glee club to ambush her enemies with a low, ominous "devil's harmony" that causes them to fall into a vegetative state.

Unaware that he is the next target, he plans to invite his remaining team members to his house to announce the news and asks Kiera to come over that night.

He encounters a vengeful Kiera with her glee club, but as the members harmonize, he breaks into song and reveals the truth before declaring his love for her.

The glee club, shocked and betrayed, sing the devil's harmony, causing Connor and Kiera (who was not wearing the earplugs she usually used for protection) to fall asleep.