In a universe where destiny is forged in the fires of war, the ThunderCats rise from the ashes of a dying world to reclaim their home and their honor. Lion-O (Henry Cavill) must step into the role of leader, bearing the weight of his people’s hope, while battling the forces that seek to destroy not only his world, but everything he holds dear. With the fate of the planet Thundera in his hands, Lion-O faces a struggle greater than any battle—he must confront the darkness within himself.

The jungle has turned to ruins, and the once-proud kingdom is now a shadow of its former glory. With the ever-looming threat of the Mutants, the ThunderCats must find strength in each other, drawing from the bonds of family and friendship that have kept them alive through countless trials.

Tigra, Cheetara, Panthro, and the others stand by Lion-O, each fighting their own battles, but it is Lion-O’s destiny to lead them to victory—or to doom them all. As love, sacrifice, and destiny collide, can he rise above his doubts and fears to become the hero Thundera needs?