A betrayal. A reluctant leader. A journey like no other. Evil Mumm-Ra's attack on the city of Thundera destroys the cat civilization, leaving only a band of survivors - Tygra, Panthro, Snarf, Cheetara, Wily Kit and Wily Kat - and young prince Lion-O, the surviving ruler of his people. As the threats of Mumm-Ra ring in their ears, these determined cats know what they must do: find the Book of Omens, which holds the key to their future. Using his powerful Sword of Omens to achieve "sight beyond sight," Lion-O guides his friends across the lands, facing vicious foes and making new allies.