Two school boys discover a spaceship which takes off when they get in, leaving a sister behind to fail to convince the adults what’s happened. The ship is almost hit by a meteor, but Gamera, who was perusing space for lost children, saves the day. But the mighty turtle can’t keep up with the spaceship, which lands on Terra, a planet on the other side of the Sun from Earth. Terra is under constant attacks from space gyaoses, which the only two survivors of this alien world fend off with Guiron, a quadrupedal shark with a knife for a head. They plan to eat the children and travel to Earth, but finally Gamera arrives.
Gamera vs. Guiron is much like the previous film, Gamera vs. Viras. Again we have two kids (one Japanese, one American) in space. It’s much more a kids adventure film than a daikaiju flick. There’s no city crunching here. The two kids wonder around the new and exciting planet and comment to each other about the things they see and what they will do next. This is a movie where kids with a dart gun are as effective as super-technological aliens. Adults, not counting aliens, are hardly in the film and are useless (and manage to be more annoying than the children).
And again, it is really cheap. There’s plenty of reused footage to save money (they don’t even bother tinting the scene from the B&W Gamera The Giant Monster). The planet is made up of a few small sets with a few simple miniatures, and obvious map paintings. In one scene rocks come crashing down and you can see the Styrofoam bounce off the children. Guiron is a ghastly looking monster that didn’t push the budget.
On the bright-side, the two alien chicks are quite cute and wear spangly outfits with capes. That’s as sexy as a Gamera movie gets.
Be ready for multiple renditions of the Gamera song. The film ends with the moral: We shouldn’t dream of other planets, but make this one free of “wars and traffic accidents.”