A loner mammoth, a goofy sloth, and a cunning saber-toothed tiger reluctantly join forces to return a lost human infant to his tribe, all while being hunted by a pack of saber-toothed tigers.
A young child named Boo finds herself trapped in a world of grievous monsters, who use human screams to power their city of fear… Boo somehow needs to find a way back to her home world.
