When the evil Beast Planet destroys the Planet Tek, only Princess Tekla escapes. She crashes on the distant Planet Ice and warns King Cryos and some raiders from Planet Rock of their imminent danger. Graveheart, a hero made of rock, swears to fight the menace. But defeating the Beast Planet's forces will require the four worlds of the solar system to abandon centuries of warfare and unite. King Cryos and his feisty daughter travel with Graveheart to Planet Rock. King Mantle rejects the idea of an alliance and exiles Graveheart, but Graveheart's friend Jade joins the group. On Planet Fire, they recruit young Prince Pyrus. The dedicated cadre fights their first major battle on Planet Bone. King Femur tries to play both ends against the middle and finds himself attacked by Beast Planet.