Jamal, Lenni, and Alex are graduating from middle school and Tina is hosting the party, while Jamal and Tina work on the prom committee. However, the band that was supposed to play at the prom backed out. Jamal and Tina convince Lenni to play with Tina's brother Tuan. However, Lenni and Tuan get off to a bad start. Eventually, they learn to play their music together. In the meantime, Alex has been writing the story. He writes about the Slime Monster running away and kidnapping Gaby and about his attempts to save her.
