MASTERS OF UNIVERSE TMNT TURTLES OF GRAYSKULL #4 CVR A WILLI

The mastermind is revealed! In the wild conclusion to this wicked series, we discover who has been tying the threads of the He-Man and Teenage Mutant Ninja Turtles universes together. He-Man and the Teenage Mutant Ninja Turtles find themselves facing-off against unthinkable mutations and chaos-but this time there's no reboots, no safety net, and no rules! Can our teenaged heroes prevail?