The first U.S. mission to Venus crash-lands off the coast of Sicily, unknowingly bringing back a mysterious reptilian creature that rapidly grows to a monstrous size.
In 2020, after the colonization of the moon, three spaceships are launched from Lunar Station 7. They are to explore Venus under the command of Professor Hartman, but an asteroid collides and explodes Capella.
Quirt Evans, an all round bad guy, is nursed back to health and sought after by a Quaker girl and finds himself having to choose between his world and hers.