High school students enter a time gate to an unknown planet for a survival test, but something goes wrong and they have to learn to survive by their own resourcefulness.
While accompanying their uncle, a wily politician, on a trip from Mars to Earth, Podkayne and her brilliant, but pesky brother are caught in a plot to keep Uncle Tom from an important conference. Reprint.
In a futuristic military adventure a recruit goes through the roughest boot camp in the universe and into battle with the Terran Mobile Infantry in what historians would come to call the First Interstellar War
This is the epic saga of an earthling, Valentine Michael Smith, born and educated on Mars, who arrives on our planet with "psi" powers--telepathy, clairvoyance, telekinesis, and the ability to take control of the minds of others--and yet with complete innocence regarding the mores of man.
When the Stone twins made up their minds to leave Lunar City in a secondhand spaceship, they hadn't planned on having their whole family accompany them. But the Stones were not your ordinary Lunar family -- no way! -- and their voyage through the solar system sure proved it. What began as a simple business expedition to Mars soon mushroomed into a dangerous situation when Grandma Stone was lost in space. Then, just when everything seemed to be getting better, a Martian flatcat came aboard and fouled up the works. But the real trouble didn't get underway until the Stones headed for the asteroid belt to take up a mining proposition they, somehow, couldn't refuse . . .
Earth was being invaded by aliens and the top security agencies were helpless: the aliens were controlling the mind of every person they encountered. So it was up to Sam Cavanaugh, secret agent for a powerful and deadly spy network, to find a way to stop them--which meant he had to be invaded himself!
One minute, down and out actor Lorenzo Smythe was -- as usual -- in a bar, drinking away his troubles as he watched his career go down the tubes. Then a space pilot bought him a drink, and the next thing Smythe knew, he was shanghaied to Mars. Suddenly he found himself agreeing to the most difficult role of his career: impersonating an important politician who had been kidnapped. Peace with the Martians was at stake -- failure to pull off the act could result in interplanetary war. And Smythe's own life was on the line -- for if he wasn't assassinated, there was always the possibility that he might be trapped in his new role forever!
Dan Davis was tricked by an unscrupulous business partner and a greedy fiancee into spending thirty years in suspended animation just when he was on the verge of a success beyond his wildest dreams. But when he awoke in the future, he discovered he had the means to travel back in time -- and get his revenge!
One minute Kip Russell was walking about in his backyard, testing out an old space suit and dreaming about going to the Moon -- and the next he was out cold, the captive of an insidious space pirate. The whole thing seemed like a bad dream until Kip discovered there were other prisoners on board, and they were all on their way to the Moon -- and a fate worse than death!
A nuclear blast sends Hugh Farnham and his family flying two thousand years into the future where humans are forced into slavery as punishment for having nearly destroyed the world.