The United Planets Chief Astronomer discovers a planetoid has exploded. He sends an urgent report to Major Robertson at Space Control the debris posses a danger to all space raft in the area. Commander Corry, Cadet Lucky and Carol are returning to Terra from Earth when their space craft is struck by a meteor. They find themselves in dire straights: unable to navigate, unable to communicate, and venting oxygen through a hull rupture. (thetvdb.com)