For generations, the Thunderians have lived and thrived in the kingdom of Thundera. However, one night the kingdom is attacked by the Lizard army led by the evil sorcerer Mumm-Ra and Grune the Destroyer. After Thundera is destroyed, a small band of surviving Thunderians led by the young heir to the throne Lion-O (who wields the powerful Sword of Omens) flees in order to seek out the Book of Omens, which is said to have the knowledge needed to defeat Mumm-Ra. Even when they find it, they must keep the Book of Omens from falling into the wrong hands and find a way to defeat Mumm-Ra once and for all. The Thundercats discover that they have to find three stones of power before Mumm-Ra does. A fourth stone of power is revealed by the book to be the Eye of Thundera itself, which is embedded in the Sword of Omens.

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