The spaceship AAB-Gamma is dispatched from FAFC headquarters in Japan to make a landing on the planet Mars and investigate reports of UFOs in the area. As they near the red planet, they encounter a mysterious UFO that coats the ship's hull with unusual spores. Taking one of the specimens back to earth, it soon develops and grows into a giant chicken-lizard-alien monster that tramples Japan.

• Shochiku
• Shunya Wazaki
• Itoko Harada
• Shinichi Yanagisawa
• Keisuke Sonoi
• Hiroshi Fujioka
• Eiji Okada
• Peggy Neal
• Franz Gruber