During an ambush, Lion-O falls to his death, but he is given a second chance at life – if he can pass a series of trials that pit him against each of his teammates.
Lion-O becomes homesick, and his memories of Thundera are almost nonexistent. Jaga appears to Lion-O and tells him that on their spaceship, they brought with them a time capsule which contained a recording of Thundera and its history up to the time it was destroyed. The Thundercats set out to search for their time capsule.