|Rainn Wilson||Robert ``Fish'' Fishman|
|Jane Lynch||Fish's Sister|
|Will Arnett||Vesuvius bandmate|
|Ed Helms||Vesuvius bandmate|
|Fred Armisen||Vesuvius bandmate|
|Howard Hesseman||Tour bus driver|
As a drummer with the '80s hair band Vesuvius, Robert ``Fish'' Fishman lived his dream as a rock 'n' roll demigod until his band mates kicked him out. Twenty years later, Fish gets a second shot at sitting on the throne of music stardom when his teenage nephew's group hires him as the new drummer.