The film begins with an ominous black screen accentuated by thunderous crashes, soon revealing a tempestuous ocean. The title appears alongside Godzilla's iconic roar. Narrating the chilling scene is Steve Martin (Raymond Burr), who states, “This is Tokyo, once a city of six million people. What has happened here was caused by a force which up until a few days ago was entirely beyond the scope of man’s imagination.” As he emerges from the debris, battered and bloodied, he conveys the horror around him. He tells us, “My name is Steve Martin. I’m a foreign correspondent for United World News. I was headed for an assignment in Cairo when I stopped off in Tokyo for a social call, but it turned out to be a visit to the living hell of another world.” His struggle to stand leads him to faint as medical personnel transport the injured to makeshift hospitals.
Among the chaos, Emiko Yamane (Momoko Kôchi), daughter of a prominent paleontologist Dr. Yamane, is seen assisting in the hospital. As Steve is carried on a stretcher, he catches a glimpse of Emiko and gropes for her attention. She informs him that her father is safe at a meeting with security officials before leaving to find a doctor for Steve. Transitioning into a flashback, Steve reflects on the sheer disbelief of lying alive in a hospital amidst the dead. He recalls his plans to meet an esteemed friend, Dr. Serizawa (Akihiko Hirata), a theoretical scientist known for his groundbreaking experiments.
As turmoil brews, an eerie menace strikes a ship at sea, leading to its fiery demise while sending out a distress signal. Upon arriving in Tokyo, Steve finds himself embroiled in a web of security inquiries about the ship’s mysterious sinking, linked with reports of strange occurrences. Tomo Iwanaga—the security officer—sheds light on the incident only enough to stoke Steve's journalistic curiosity, inviting him to briefing sessions with the ship’s owners when the fate of several similar vessels unfolds tragically.
With the looming threat, a rescue ship is set for investigation, only to meet a similar fate. Determined to uncover the truth, Steve decides to stay in Tokyo amidst growing reports of several survivors’ harrowing encounters with a creature in the waters. The narrative progresses to a meeting where Dr. Yamane, a semblance of hope amidst despair, is invited alongside Steve, prompting suspicions about Odo Island’s proximity to the attacks.
A harrowing visit to Odo Island reveals ancient legends where locals mention a monstrous presence. They witness a terrifying ceremony as fate leads them through a relentless typhoon that night. In the aftermath, alarming revelations surface: enormous and radioactive footprints trace back to the ocean. The creatures haunting the remnants of the once-bustling city unveil the massive creature dubbed Godzilla, instilling terror amongst the inhabitants.
As the story escalates, politics and personal affairs intertwine with the scientific pursuit for understanding Godzilla. Emiko finds herself caught between her engagement to Dr. Serizawa and her undeniable connection with Ogata (Akira Takarada). Both men hold crucial roles in the impending conflict against the looming menace, with Dr. Yamane (Takashi Shimura) advocating for study over extermination, presenting a moral dilemma amidst devastation.
Eventually, as Tokyo braces for impending doom, Godzilla’s destructive path becomes undeniable, plunging the city into chaos. Amidst the destruction, as Ogata and Emiko confront Serizawa, they rally for his radical invention, the "oxygen destroyer." The turmoil culminates when Serizawa chooses to confront Godzilla himself, deploying the weapon to end the monster's reign.
The tragic sacrifice of Serizawa leads to a pivotal moment where Godzilla meets its end, writhing in pain before vanishing into the depths, leaving only its skeletal remains behind. The film closes poignantly as Steve states, “The menace was gone; so was a great man. But the whole world could wake up and live again.”
