Second Variety

In "The Variable Man", Earth (The Terran System) is in a cold war with the older, corrupt Centaurian System, which suppresses Terra from exploring space and expanding its borders. When a devastating new weapon called Icarus is developed by Terra, everyone expects the odds to tip in Terra's favor. But the computers calculating these odds find an unknown variable that throws off the odds. A time traveler from 1913 known as Thomas Cole has arrived. Can this variable man from the past rescue mankind from a catastrophic future?

In Mr. Spaceship, humans in the distant future are at war with alien life forms known as Yuks. Using outdated mechanical machines to wage war against the life-based weapons of the advanced Yuks, a research team decides to build a spaceship powered by a human brain. Enlisting a dying professor who agrees to donate his brain to the project, the humans believe they have turned the tables on the Yuks. But the spaceship has other plans.

In The Defenders, the Soviet and American survivors of a nuclear holocaust have created vast underground tunnels, so as to continue the war on the surface via remote control robots. When a robot from the surface is found not to be radioactive, a team of American scientists returns topside to investigate this anomaly. Expecting to see massive devastation, the scientists are unprepared for the shocking truth that awaits them.

In "The Gun", a group of space explorers are shot down above a deserted planet. While some of the crew work on repairing the ship, the remainder set out to investigate the planet. Otherwise unpopulated, they discover the huge gun that shot them down sitting atop a trove of cultural artifacts from a bygone civilization. What harm could come of dismantling the gun and taking a few of the artifacts home with them?

In "The Skull", a convict is offered his freedom if he agrees to travel back in time and kill someone. He learns that the assassination target was the founder of a religious sect that grew in strength and influence from its inception in 1960. Carrying his target's skull so he can identify the religious leader, the convict comes to learn a terrible secret about why he was chosen to find its owner.