Zack, Cody, Max, and Tapeworm organize a band called Rock Squared for battle of the bands, but due to fighting, Zack and Cody quit the band at different times. On the day of the event, Max locks the twins in their closet, but they find their own way there, provided by Arwin. Meanwhile, Maddie and Lance's band Waterworks for battle of the bands instruments' are funded by London after they promise she can be a back-up singer, but she is a terrible singer.

Guest stars: Alyson Stoner as Max, Dennis Bendersky as Tapeworm