When a recurring vision torments leader Lion-O, the Thundercats realize that three more Thunderians must have survived the destruction of Thundera! A daring rescue mission pits the Thundercats against the villainous Mumm-Ra, who has strengthened his forces of mutants and broadened the range of his dark territories. Ultimately Lion-O saves the new Thunderians, but the cost is high: Mumm-Ra becomes even more powerful and more determined to destroy the Thundercats! Featuring new friends, new foes and new battlefields. Season Two, Volume Two of this awesome animated favorite roars with more than 12 hours of rousing adventures.