DVD: Rocky Jones, Space Ranger - Menace From Outer Space: Richard Crane

A mysterious, crystal-like missile is launched from a moon of Jupiter and crashes near Professor Newton's lab. Rocky Jones and his crew are dispatched to the moon to investigate the origin of the missile and establish peaceful relations. They  discovers a technologically advanced but misinformed alien race on the moon, led astray by the evil Professor Kardos. The situation is complicated by the arrival of Rocky's old enemy, Griff, who has his own scheme to take over the moon and use its weaponry against Earth!