A flying saucer built by the U.S. government is launched into space on a top secret test flight. Due to some unknown reason, the saucer can only be piloted by a woman (male test pilots died of radiation poisoning). Sheila Sommars is the pilot chosen and all goes well until Jose Ortega, an exiled ruler for an outlaw nation, uses a secret remote control device to cause the ship to land at his secret base in Mexico.