Synopsis

Haunted by recurring nightmares—visions of fallen Thunderians lost on Thundera during his escape with Jaga and others—Lion-O is roused from sleep. Jaga arrives to reveal a startling truth: those he mourned did, in fact, survive, now living on Third Earth. Gathering the other ThunderCats, they resolve to seek out their lost brethren, unaware that Mumm-Ra harbors his own designs for the future.