Gamera vs. Viras

An alien spaceship from Planet Viras nears Earth with the intent to occupy the planet for its atmospheric nitrogen. Gamera confronts the craft and destroys it, preventing an invasion. Before it is destroyed, the aliens broadcast a warning to their world, declaring Gamera their enemy.

At an aquarium on Earth, a group of Boy Scouts observe scientists working on a two-man mini-sub. Masao (Japanese) and Jim (American) manage to talk their way aboard and join the test run.

During the dive, the boys spot Gamera swimming nearby and engage in a playful race with him. The lighthearted moment ends when their hijinks draw attention from larger dangers.

A second alien vessel envelops the boys in a Super-Catch Ray, immobilizing them. Gamera helps the boys escape, but remains trapped in a force field as the aliens scan his memories.

Through analysis of Gamera's memories, the aliens learn of his weakness: his soft spot for children. This knowledge gives them leverage over him during later confrontations.

The force field weakens, and Gamera breaks free from the containment. He regains his freedom just as the captives' hope sinks.

The aliens capture Jim and Masao, threaten to kill them, and demand Gamera obeys their commands. The boys struggle to stay hopeful as the situation grows dire.

Powerless to resist, Gamera surfaces and follows the UFO ashore, where a mind-control device is attached to the back of his head. The device locks him into the aliens' will, setting the stage for the next confrontation.

On the spaceship, the boys continue to attempt escape. Gamera, under alien control, rampages and destroys dams and cities, spreading chaos across the planet.

The boys spot a squid-like creature aboard the ship and mistake him for a captive. In truth, he is the leader of the alien invasion plotting the bigger plan.

The boys devise a plan to disrupt the mind-control. They succeed, and Gamera breaks free from the device, restoring his own will.

Gamera launches a direct assault on the alien spaceship. He uses his regained strength to push back the invaders and disrupt their operations.

Grounded by Gamera's interference, the aliens reveal that their human forms were disguises, and that all of them resemble their leader. Under the leader's command, they merge to form Viras, a colossal monster.

Viras and Gamera clash in a fierce battle in the atmosphere. Viras impales Gamera with its spike-like mantle, but Gamera answers by flying higher and freezing Viras solid, then drops the frozen monster into the ocean where it disintegrates.

With Viras defeated, crowds of people celebrate Gamera's victory. The hero is hailed for saving the planet, and the day ends with a grateful, hopeful mood.