Siblings Mitch, Tony, and Jovi discover that mysterious creatures called Grezniks are close to achieving their mission: blowing up Earth and shattering Life to bits. Over the centuries, Grezniks have nearly succeeded many times. But each time, their efforts have been foiled by Tukors and their allies. Now, Grezniks are closer than ever before. Mitch, Tony, and Jovi are unexpectedly invited to help defeat the Grezniks, but will they have the courage to join the battle?