In "I'm In The Band," Tripp Campbell joins his favorite "vintage" rock band, Iron Weasel, and becomes determined to help the band he idolizes make an epic comeback. He's certainly got his work cut out for him with the trio of rock star misfits whose stars have fallen so far that they can't even afford their own housing and are forced to share bunk beds in a guest room at Tripp's house.
Nonetheless, in their own off the wall way, the three stooges will do their best to help Tripp steer through his teenage years with the goal of turning him into a bona fide rock star and giving him the chance to live out his dream.
The band holds a Rocky Fantasy Camp, a day camp where kids learn how to play a few songs and fulfill their dreams of being rock stars. When the guys realize that rock superstar Eddie Nova's kid is enrolled in their camp, they promise to turn his son, Junior, a quiet, classic cellist into a rock star, in exchange for being the opening act in Eddie's next tour.
Iron Weasel is challenged with writing a new song for their record producer Simon Craig, while taking care of his son, Charles, who happens to be their number one fan. Charles claims to be an even tempered kid now, but the guys are suspicious of his behavior.