Otis Adelbert Kline: 42 books

A man from Earth goes to Mars, and discovers a violent civilization complete with monsters, people, and other Earth-like creatures.

I TELL you, Evans," said Dr. Dorp, banging his fist on the arm of his chair for emphasis, "the science of psychology is in much the same stage of development today as were the material sciences in the dark ages." "But surely," I objected, "the two centuries of investigation...

Fred Jorgeson, the Human Fly, Could Scale Anything—Even the Walls of Time!

Derring-do on a world of primitive monsters! When Robert Grandon swapped bodies with a prince of the planet Venus, he was concerned only with the thrill and interest of living on a different world. But the situation he found himself in was hardly that of a leisurely sightseer. Instead, he found himself...

Smaller than a microbe, the Stranger was—but how he grew! Ralph Blake's surprise kidnapping flung him into fierce adventure in the torrid Sahara. Then a strange creature from Mercury stepped in—and even Ralph's death couldn't prevent him from unraveling the network of intrigue! 

Scientists and inventors have made enormous strides for-and in many ways, against-humanity, for they have discovered and invented powerful destructive materials-in that way sometimes courting their own destruction. So many "impossible" things have been done, why is it not possible that the...

Grandon embarks on a perilous search for a missing royal daughter and a port filled with pirates. This is the 3rd book in the Planet of Peril series.

This astonishing science-fiction classic begins like a prophecy of today's space achievements--a missile is fired from Earth to hit the surface of the Moon. It is successful and the misslemen are heroes, until...the Moon fires back!

A series of volcano eruptions has unleashed new monsters upon the earth…

Smaller than a microbe, the Stranger was—but how he grew! Ralph Blake's surprise kidnapping flung him into fierce adventure in the torrid Sahara. Then a strange creature from Mercury stepped in—and even Ralph's death couldn't prevent him from unraveling the network of intrigue!

I TELL you, Evans," said Dr. Dorp, banging his fist on the arm of his chair for emphasis, "the science of psychology is in much the same stage of development today as were the material sciences in the dark ages." "But surely," I objected, "the two centuries of investigation...

Through the discoveries of the scientist, Dr. Morgan, a young Martian's astral body is projected into the body of one Harry Thorne on Earth, and from Earth to Venus, or "Zarovia," where the man of Mars becomes Prince Zinlo of the mighty empire of Olba. Zinlo is instructed by Morgan's fellow-scientist...

Derring-do on a world of primitive monsters! When Robert Grandon swapped bodies with a prince of the planet Venus, he was concerned only with the thrill and interest of living on a different world. But the situation he found himself in was hardly that of a leisurely sightseer. Instead, he found himself...

"I TELL you, Evans," said Dr. Dorp, banging his fist on the arm of his chair for emphasis, "the science of psychology is in much the same stage of development today as were the material sciences in the dark ages." "But surely," I objected, "the two centuries of investigation...