While out on a scouting mission in unexplored terrain, Cheetara encounters a rogue cell of Mu'Tants. In the course of subduing them, she discovers that a much larger Mu'Tant horde led by Slithe is mobilizing to attack the last survivors of Thundera at that very second!

Now the ThunderCats' swiftest warrior must reach the Cat's Lair before the Mu'Tants to sound the alarm - while also battling against Slithe's forces every step of the way!