Space Ranger Blast is sent on a mission by the Chief Ranger to track down the mysterious leader of a space pirate gang. The gang is equipped with "thousands of fantastically ingenious devices" which make them unstoppable. Blast fakes his death. He takes on the identity with the name "Mason" and goes undercover to crack the gang. He discovers the pirate leader is a physicist named Torro who faked his own death. Blast arrests Torro with the help of his fellow Space Rangers. On the trip back, Torro overcomes Blast with an immobilizing gas and escapes with another spacecraft.