Battle in Outer Space

Global disasters strike Earth in 1965. A railroad bridge in Japan levitates, causing a train wreck. A Panama Canal ocean liner is lifted from the water by a waterspout, Venice endures severe flooding, and the J-SS3 space station is destroyed. Survivors suffer extreme frostbite, hinting at a shared, unknown cause.

Leaders convene at the Space Research Center in Japan to address the disasters. Dr. Richardson posits that lowering temperatures near objects reduces Earth's gravity, making them easier to lift, while Katsumiya suggests the force is extraterrestrial. The conference begins to map out a response to the unfolding crisis.

Ahmed collapses in the courtyard, dazed, as a red light pours from the sky. Etsuko Shiraishi witnesses the event, and Iwamura reports the strange phenomenon. The participants begin to suspect that aliens are behind the disasters.

Ahmed returns to sabotage the heat-ray experiments and curses the Earth with Natal colonization. He briefly takes Etsuko hostage and is warned of the coming alien influence; his hand is injured during the struggle. A Natal saucer vaporizes him, but forensics reveal a tiny radio transmitter that locates the aliens on the Moon.

Two SPIP rockets are launched toward the Moon in a UN reconnaissance mission. En route they are attacked by remotely controlled meteors called space torpedoes, and Iwamura is momentarily under alien mind control as he tries to disable the weapons. The SPIPs avoid the meteors and press onward, despite a Natal warning not to land.

Iwamura unties himself and detonates SPIP-1, sacrificing the craft. The survivors reach a lunar crater and locate a Natal base hidden in a deep cave. Etsuko is briefly captured during the assault, but Katsumiya comes to her aid.

On the Moon, a beam weapon battle erupts as the teams assault the Natal base. The Natal base is destroyed and Iwamura is freed from mind control. He stays behind to provide covering fire, enabling SPIP-2 to escape.

With the Moon victory secured, the world mobilizes for a climactic counteroffensive. Rocket Fighter Planes, based on the X-15, and Atomic Heat Cannons are developed and deployed to counter the Natal fleet. The human defense prepares for a full-scale space battle.

Natal saucers and their mothership near Earth spark a major space engagement. Scout Ships are repurposed into space fighters to join the dogfight in orbit. The Natal fleet presses toward Earth, threatening the planet.

The Natal mothership launches space torpedoes that strike New York and San Francisco, causing widespread devastation. Panic spreads as the invasion fleet closes in on Tokyo. Earth's defenses readiness is tested to the limit as the countdown to a climactic battle begins.

The mothership descends on Tokyo and unleashes an anti-gravity ray that lays the metropolis to waste. The remaining Natal saucers and the mothership advance on the Space Research Center as Earth's forces rally their defenses. The fate of humanity hinges on a last-ditch counterstrike.

In the final clash, space fighters engage the surviving Natal ships and the Atomic Heat Cannons deliver a decisive blow. The Natal mothership is destroyed, ending the invasion and saving Earth. Humanity breathes a collective sigh of relief as the crisis ends.