The Robot Freighter Mystery is the 29th produced episode and the 27th Broadcast episode of the series Fireball XL5
Someone is sabotaging robot freighters and Commander Zero and Steve Zodiac suspect the Briggs Brothers of the Space Salvage Company. Steve discovers that Jock's new assistant, Edmundo, is planting bombs in a freighter and duly handcuffs him there. He then forces the Briggs Brothers to he freighter and handcuffs them as well. He tells them that a bomb has been put in the ship and will go off if they don't confess. With only thirteen seconds left Edmundo confesses. But the bomb isn't a bomb at all, just a music box.