 Star Command is directly in the path of an asteroid field. Buzz and the Rangers respond to the emergency and start to destroy the asteroids...but they keep on coming. The asteroids appear to be under some power source that is aiming them at Star Command. Buzz and XR take off to find the source of the asteroid attack and Mira Nova and Booster stay behind to help Star Command. The source of the attack is an evil, female, Big-Headed alien known as Gravitina,the Mistress of Mass...and she has a big crush on Buzz.