Fleeing their dying homeworld, the THUNDERCATS have settled on Third Earth, a strange planet populated by fantastic creatures. LION-O, the Lord of the THUNDERCATS, will need the wisdom of his departed teacher JAGA, as well as the strength of his comrade PANTHRO, to keep his people safe. Especially since the evil sorceror MUMM-RA has his sights on Lion-O's Sword of Omens, which contains the powerful Eye of Thundera. THUNDERCATS, Ho!