Helplessly trapped, the machine men heard the ultimatum of the terrible Heolons of Bhem: "Give us back the secret that has been dust these thousands years-or, as living metal statues, adorn our halls...

Meteors may contain strange and valuable elements. It is the exploration for such things that our author has used as a basis for his aviation story of outer space. Excerpt High up, on the top floor...

Professor Jameson and his immortal band of robot-bodied Zoromes find a derelict space-ship-and in it the deadliest, mind-destroying danger of their careers! Excerpt With a metal tentacle, Professor...

Excerpt Professor Jameson clung more tightly to his precarious perch on the sloping mountainside. His metal tentacles curled about treacherous knobs of slippery rock. His mechanical eyes circling the...

Desperate, lost, the machine men of Zor took off on the most perilous mission they had ever faced-against a foe that could not die! Excerpt Since reaching Zor, this new expedition had embarked upon...

Professor Jameson and the other metal Titans of his band of Zoromes return to free the industrious race of Moeps from the oppression of the tyrannous Aemts... Excerpt "We have seen no intelligent on...

Interplanetary commerce, if and when it begins, will be fraught with all of the dangers that accompany pioneering expeditions. There will be the terrible climatic conditions on other worlds to be faced,...