The Ruler, a diabolical scientist who wants to enslave the Solar System, learns of Commando Cody's design for a rocketship that can go anywhere in outer space. He is determined to sabotage Cody's work." Commando Cody and his new assistants, Joan Gilbert and Ted Richards, help him develop an atomic powered rocketship. The Interplanetary Commission has received a warning from a mad scientist known as The Ruler, so Commando Cody is named the new Sky Marshal of the Universe to combat the threat. He develops a cosmic dust blanket to encircle the globe and disintegrate enemy craft. The Ruler fears Cody's abilities and sends agents to sabotage his rocket and to learn the secret of the cosmic dust blanket.
From Republic's press release: ""Lenotto is sent to the Earth by the Ruler to help Dr. Varney in destroying Commando Cody. First they try to gain Cody's confidence by introducing him to a new element. When given the opportunity they try to steal Commando Cody's rocketship and in the ensuing scuffle Lenotto is killed with his own gun."" Unable to penetrate the cosmic dust blanket with his warships, the Ruler sends an agent Lenato inside a small missle headed for earth. Lenato carries Thenustrium: a new element developed on Planet X. Lenato tells Dr. Varney that Thenustrium is similar to uranium, but is easier to control. Lenato and Dr. Varney poses as scientists who have discovered the new element. They are able to get into Commander Cody's lab. Cody examines the element and realizes that combining it with uranium will allow him to construct a rocket with more power and range. When Cody leaves, Lenato and Varney kidnap Joan and Ted. They steal Cody's rocket and fly away. Lenato and Varne
From Republic's press release: ""A strange garbled message convinces Commando Cody that the Ruler is trying to contact his agents on Earth. Cody tries to find the Ruler before he can carry out his newest plot."" Commando Cody discovers that the Ruler is on the Planet Venus. Ross and Hardy learn that Commando Cody plans to fly to Venus and they sabotage his rocket ship. However, Cody manages to land the crippled ship on Venus and confronts the Ruler. The Ruler reveals his plans to conquer Earth and other habitable planets. He shows off his weapons of conquest. Cody manages to bury the ""Ruler of Outer Space"" in his operations cavern on Venus.
From Republic's press release: ""A series of destructive floods and typhoons strike all parts of the Earth. Commando Cody suspects that this is part of the Ruler's latest plan to conquer the world."" Ted Richards is transferred and replaced by Dick Preston. The Ruler uses a rocket (R-6) containing a ‘radioactive"" gas which causes hurricanes, floods and typhoons. The Ruler threatens to completely destroy the Earth unless the Earth surrenders unconditionally.
From Republic's press release: ""The Ruler has found an element on the planet Saturn that enables him to drop germ capsules through the Cosmic Dust Blanket onto the Earth."" The Ruler uses his M-7 rockets loaded with bombs which carry germ warfare agents. The Ruler issues and ultimatum: complete surrender or complete annihilation. Cody captures an unexploded M-7 and analysis indicates that the substance is ""saturium,"" available only one of Saturn's moons. Cody, Joan and Dick travel to the moon and encounter a ""magnetic drag ray."" They manage to counteract the ray and destroy the mining facility on the surface.
From Republic's press release: ""The Ruler uses a device which puts out the sun's light. Panic results all over the world as it is plunged into darkness. Commando Cody must go to the Earth's rescue."" When the Ruler blots out the sun, Cody finds he is trapped on the Earth. A saboteur has added an element to the Station #8 dispenser for the Cosmic Dust Blanket. Cody's Disbursal Ray will not penetrate the Dust Blanket and allow his rocketship to leave the Earth. Cody discovers the saboteur and traces the energy source of the Ruler's device to Planet M-27. When he reaches the planet he can not destroy the ""Atomic Device"" blotting out the sun because he is stopped by an Invisible Block.""
From Republic's press release: ""The Ruler's robot agents capture Commando Cody's assistant and carry him off to the Ruler's secret outer space headquarters. Cody must rescue him.""
From Republic's press release: ""Hydrogen hurricanes threaten to destroy the Earth. Commando Cody suspects that they are being caused by the Ruler.""
From Republic's press release: ""The Ruler puts five suns in the sky. Unless Commando Cody can stop the suns from shining, their intense heat will destroy the Earth.""
From Republic's press release: ""In a diabolical plot, the Ruler manages to couple the Earth and Saturn. This throws the Earth off its axis and causes quakes and catastrophic climatic changes.""
From Republic's press release: ""In his efforts to add the Earth to his long list of slave planets, the Ruler tries to get Commando Cody and his crew out of the way. His plans include the capture of Cody's rocketship. The method, a trumped up story told by a Mercurian.""
From Republic's press release: ""Commando Cody's rocketship is taken to Mercury by the Ruler. There the Ruler hopes to destroy Cody's dispeller ray, but is in for a surprise.""