From the back cover:
The Legion of Space, the fate of the universe is in their hands....
They are the Legion, fighters of the Revolution, sworn to defend the new democracy against all foes. But an alien solar system threatens the human planets with terror, deadly treason, and the conquering Medusae - slimy, tentacled, merciless. Now John Star and his Legionnaires must rescue the beautiful woman who guards AKKA - The ultimate, the only weapon that can save the Universe...if they survive the Belt of Peril, where death and madness lurk!
The Legion of Space, the fate of the universe is in their hands....
They are the Legion, fighters of the Revolution, sworn to defend the new democracy against all foes. But an alien solar system threatens the human planets with terror, deadly treason, and the conquering Medusae - slimy, tentacled, merciless. Now John Star and his Legionnaires must rescue the beautiful woman who guards AKKA - The ultimate, the only weapon that can save the Universe...if they survive the Belt of Peril, where death and madness lurk!