It was produced by Helen Ainsworth, directed by William Asher, and stars Gene Barry, Valerie French, George Voskovec, and Arnold Moss.

Englishwoman Evelyn Wingate, American reporter Jonathan Clark, Chinese peasant Su Tan, German physicist Klaus Bechner, and Soviet soldier Ivan Godofsky are randomly transported to an alien spacecraft in Earth orbit.

Needing a new world to inhabit within the next 35 days, yet prohibited by their moral code from killing intelligent life, The Alien provides each of the five with sets of three capsules in a clear, round, hand-held case.

Arriving in Los Angeles, Eve is met by a now-disguised Clark, who takes her to a closed race track where they can safely hide.

Repeated beatings leave Godofsky in shock, while a recovering Bechner refuses to reveal the details of the Alien's plan.

Confronted with an ultimatum for all U.S. military forces to withdraw throughout the world, one of Bechner's capsules is tested to verify the Soviet threat.

The entire Earth is blanketed with a high-pitched sonic wave from space that selectively kills every "known enemy of human freedom".

Later, humanity, unified under the United Nations, extends an invitation to the Alien and his race to coexist with us peacefully on Earth.