With the help of a rogue scientist's gadgets, a 24th Century space pirate successfully robs bank after bank throughout the solar system. Desperate to thwart the master criminal, the United Planets orders Commander Corry to transport their remaining funds to a secret artificial planetoid. Anticipating such a move, the galactic cutthroat hides a hidden speaker in Carol's medallion so he can listen in on the Space Patrol's every move. (thetvdb.com)