Chuck Rock's archrival Brick Jagger has kidnapped him and no one can save him except his own crazy, club-swinging, six-month old son, Chuck Junior. The son of Chuck doesn't have the belly that his dad does so he has to rely on his club to bonk the baddies aside. The club can also be used to knock through piles of rocks, some of which may contain baby bottle power-ups that let Junior recover lost health. The son makes friends at least as easily as the dad, and friendly animals sometimes appear to give Chuck Junior rides across tricky terrain.