The Frozen Heart

Ming's forces kidnap LJ's girlfriend, Kate, turning her into a Frost Person, and have her trick LJ, Rick and Jedda into handing the Defenders' Space Station - now armed with a lethal laser-cannon - over to Ming. When the Swordship is shot down, the adult Defenders initiate the Space Station's self-destruct program but, having survived the crash, they learn that Rick, LJ and Jedda are on the Space Station. There follows a race against time to abort the self-destruct program before it is too late.