is a 1969 Japanese kaiju film directed by Noriaki Yuasa, written by Niisan Takahashi, and produced by Daiei Film. It is the fifth entry in the Gamera film series, following Gamera vs. Viras, which was released the previous year. Gamera vs. Guiron stars Nobuhiro Kajima, Miyuki Akiyama, Christopher Murphy, Yuko Hamada, and Eiji Funakoshi. The film was released theatrically in Japan on March 21, 1969. It did not receive a theatrical release in the United States, but was released directly to American television that year by American International Television under the title Attack of the Monsters. The film was followed by Gamera vs. Jiger the following year. Plot While scanning the skies through their telescope, two young boys, Akio and Tom, spy a flying saucer descending into a nearby field. Stunned, bewildered, and bemused, they tell Akio's mother what they have seen, but she dismisses their story as childish nonsense. The next day, the two boys — with Akio's younger sister, Tomoko, in tow — cycle to the site to investigate. Enthralled, Akio and Tom manage to steal into the spaceship. But then, without warning, the ship takes off, leaving Tomoko behind. It soars into outer space toward a field of asteroids, which sends the boys into a panic. However, Gamera (obviously aware of the boys' plight) appears and clears a path for the ship through the asteroids. The spaceship, flying near the speed of light, leaves Gamera behind and transports the boys to an unknown planet, where it lands on the outskirts of an alien city. Suddenly, a silver "Space" Gyaos appears, menacing the ship and the two young boys. Just before the creature attacks, a second, bizarre monster — whose head resembles a Bowie knife — emerges from an underground lair and attacks the Space Gyaos. The Space Gyaos emits a beam that reflects off the new creature's blade-shaped head and cuts off its own right leg. After the Space Gyaos attempts to retreat, the knife-headed creature lunges and chops off the Space Gyaos' left wing, before cutting off its right wing. The creature then cuts the helpless Space Gyaos' head off and brutally cuts the body into smaller pieces before retreating back to its lair. Akio and Tom explore a portion of the alien city and meet the planet's only inhabitants: two beautiful women, named Barbella and Florbella, who explain that their planet, known as "Terra", orbits