The prehistoric Croods family live in a particularly dangerous moment in time. Patriarch Grug, his mate Ugga, teenage daughter Eep, son Thunk, and feisty Gran gather food by day and huddle together in a cave at night. When a more evolved caveman named Guy arrives on the scene, Grug is distrustful, but it soon becomes apparent that Guy is correct about the impending destruction of their world.

After Megamind, a highly intelligent alien supervillain, defeats his long-time nemesis Metro Man, Megamind creates a new hero to fight, but must act to save the city when his "creation" becomes an even worse villain than he was.