In the year 1965, Earth endures a cascade of baffling and devastating events that seem almost impossible to comprehend. Bridges float off their foundations, trains are derailed as a railroad structure literally rises beneath them, and a colossal ocean liner is lifted from the sea by a violent waterspout, torn apart as it crashes back into the water. Severe floods swallow Venice, and a crucial space outpost, the J-SS3, is annihilated. These incidents share a chilling pattern: they involve objects of all sizes suddenly being lifted from their surroundings, hinting at a force that somehow lowers gravity by chilling temperatures to levels that make mass easier to move. The gravity shift appears to be a passive effect of a powerful, external agent rather than a random disaster, prompting investigators to consider that a hostile force is at work beyond Earth itself.
A UN-connected, international gathering is convened at the Space Research Center in Japan to confront an extraordinary mystery. At the center of the discussions are Major Ichiro Katsumiya, Ryô Ikebe the seasoned pilot at the heart of the defense effort, along with Professor Adachi, and Dr. Roger Richardson, who collectively piece together the scale and reach of the disturbances. They outline a sensational theory: the disasters point to an intelligent presence from outside our planet, possibly aliens, who might be testing Earth’s defenses and readiness. Survivors from the incidents are found to suffer from extreme frostbite, a symptom that supports the idea of a chilling force at play. As the debate grows more urgent, the possibility of preparing militarily for a looming encounter becomes a serious and widely discussed option.
Among the delegates is Dr. Ahmed, an Iranian physician whose behavior at the meeting raises alarms. He experiences a crippling headache and slips away briefly, only to reappear altered and dazed. In the courtyard, the quiet observer Etsuko Shiraishi witnesses a startling event: Ahmed is enveloped by a red light from the sky. The moment is unsettling enough for Iwamura, the brave astronaut, to report back that something otherworldly is happening. Soon enough, the conference is forced to confront a troubling possibility: Earth might be facing an invasion by beings from the planet Natal. The tension rises as Ahmed returns, sabotaging the experimental heat-ray efforts and threatening to derail the defense initiative. He briefly takes Etsuko hostage, signaling the gravity of what is at stake, before a Natal scout saucer abruptly materializes and eliminates him. Forensics later reveal a tiny transmitter lodged within him, guiding investigators to a celestial origin—locus Natal—on the Moon.
To answer the threat, the United Nations authorizes a bold reconnaissance mission with two rocket ships known as SPIPs. Midflight, the vessels are attacked by remotely steered meteors, or space torpedoes, designed to disrupt their trajectory and mission. The navigator of SPIP-1, Iwamura, finds himself under an alien mental influence, attempting to foil the spacecraft’s weapons and endangering the crew. Despite these obstacles, both SPIPs manage to land on the Moon and split into teams, using lunar rovers to scour a vast, desolate landscape for signs of the alien base. In a tense sequence, a Natal base is discovered within a deep crater, and Etsuko Shiraishi is briefly captured by the alien forces before being rescued in the heat of a close-quarters engagement with energy beams. The confrontation grows into a full-blown assault on the base itself, as both ground teams coordinate to smash the Natal operations.
The turning point comes when the mind-controlling influence over Iwamura is broken, freeing him to rejoin the mission and provide crucial support. He makes the ultimate sacrifice by remaining behind to cover the retreat of SPIP-2, blasting away to ensure his comrades’ escape. The liberation of Iwamura from the Natal mind control marks a pivotal moment, re-igniting Earth’s resolve to confront the alien presence. The success on the Moon strengthens the resolve of nations to defend the planet, and the defense planners begin to implement an aggressive plan of retaliation that combines air power with cutting-edge energy weapons.
Back on Earth, the global community gears up for a final, decisive confrontation. A new defense architecture is introduced: Rocket Fighter Planes—formed from experimental, high-speed, rocket-powered aircraft—and devastating Atomic Heat Cannons designed to counter the Natal armada. As Natal’s fleet of anti-gravity crafts closes in, the world sends up Scout Ships—retooled as Space Fighters—to engage the saucers in a sweeping, high-stakes space battle. The aerial dogfights are intense, with space-based combat weaving through the upper atmosphere and beyond. The Natal mothership launches devastating Space Torpedoes that strike major cities, hitting New York and San Francisco with brutal force. The looming threat shifts toward Tokyo as the mothership descends upon the capital, unleashing an ocean of anti-gravity energy that devastates the metropolis and reinforces the attackers’ intent to conquer.
In a climactic clash, the combined human forces press forward with their newly forged weapons and strategies. The battle culminates not only in a test of firepower but also in a demonstration of ingenuity and courage, as the defensive fleet fights to prevent total annihilation. The assault on Earth is repelled when the Atomic Heat Cannons deliver a critical strike, piercing the Natal mothership and breaking the would-be invasion, thereby turning the tide of the war. In the end, Earth is saved and humanity is reminded of its resilience in the face of a seemingly insurmountable extraterrestrial threat.
Throughout the narrative, the film emphasizes the precarious balance between scientific curiosity and military preparedness, illustrating how a coordinated response from diverse nations and skilled individuals can unite to defend a home planet. The events unfold with a steady, methodical pace that keeps the focus on the human elements—the leadership, the scientific reasoning, and the personal acts of courage—while never losing sight of the larger, interplanetary stakes at play. The tension between exploration and defense sustains the momentum, inviting viewers to ponder the possibilities of what lies beyond Earth while remaining anchored in the determined, human-centered effort to protect life as we know it. In the end, the story delivers a sense of cautious optimism: with global cooperation and cutting-edge technology, humanity can withstand an extraordinary challenge from the stars.
- Major Ichiro Katsumiya, Ryô Ikebe leads the charge against a relentless, mysterious threat that redefines humanity’s sense of security.
- Inspector Iriake, Fuyuki Murakami provides a steady, grounded perspective as events spiral toward an otherworldly confrontation.
- Professor Adachi, Koreya Senda and Dr. Roger Richardson, Leonard Stanford ground the investigation in science and plausible theory, bridging speculation with evidence.
- Astronaut Iwamura, Yoshio Tsuchiya endures mind control and ultimately sacrifices himself to safeguard the mission, a testament to courage under pressure.
- Etsuko Shiraishi, Kyōko Anzai becomes a pivotal figure in the human drama, navigating danger and alliance with resolve.
Note: References to Dr. Ahmed are included in the plot as a catalyst for the action, but no actor link is provided for that character since the specific performer isn’t listed in the provided cast.
