While scanning the skies through their telescope, two young boys, Akio and Tom, spy a spaceship descending into a nearby field 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, when into the site to investigate , Akio and Tom manage to steal into the spaceship. But then, without warning, the ship takes off, leaving Tomoko behind soars into outer space toward a field of asteroids, two boys into panic united Gamera appear clears a path for the ship through the asteroids the spaceship leaves Gamera behind in flying near the speed of light and transports the boys to an unknown planet Akio and Tom explore a portion of the alien city and meet the planet's only inhabitants: two beautiful women, named Barbella and Florbella explain that their planet, known as "Terra," orbits the sun directly opposite the earth, which is why it has never been discovered by earth's astronomers and suddenly turn on Tom and Akio and put them into restraints. Using their super-technological devices, the alien women probe the boys' minds, the process learning about Gamera weakness its up to gamera to stop Guiron and take two boys back to Earth.