The Odd Socks go back in time to help the young Maid Marian rescue treasure from the wicked Sheriff of Nottingham.

Rio has lost his air guitar and his confidence. The band travel through space to take him home to Planet Rock to see the Godfather of Rock, who will help him get them back.

Whiff says he needs help, so Mac invents RoboWhiff, a super-efficient robot roadie. However, things soon start to go wrong as Whiff's pushy robotic twin starts to take over the band.