The plot concerns an American astronaut, Frank Douglas, who mysteriously disappears from his spacecraft as it parachutes to Earth.

The policemen in one scene inspect the landing site of Douglas's capsule and notice a burned patch, only to dismiss it as a prank.

A team of scientists and military men also attempts to capture the monster – and at one point succeed and imprison it in the lab, only to have it escape.

Astronaut Frank Douglas, rescued, alive, well, and of normal size, some 8,000 miles away in a lifeboat, with no memory of where he has been, or how he was separated from his capsule!

One of the actors Lewis was able to rehire had dramatically changed his look in the intervening years, necessitating his playing the brother of the original character.

In fact, you may find humor in just those elements alone that make the experience one to look for mistakes, continuity errors and ridiculous logic at times.

"[7] In 1993, the film was featured in an episode of the satirical film-riffing television series Mystery Science Theater 3000 on Comedy Central alongside the short Circus on Ice.

[8] The MST3K version of the film was released by Rhino Home Video[9] as part of the Collection, Volume 8 DVD set.

It was soon re-released by Shout Factory[10] The film's original director, Bill Rebane, released a "Special Collector's Edition" with commentary and other extras on Synergy Entertainment on October 19, 2010.