In the year 1954, the United States military observes a momentous nuclear test, where a hydrogen bomb detonates just as a colossal creature rises from the depths of the ocean. Fast forward to 1999, and Project Monarch scientists Ishiro Serizawa and Vivienne Graham discover a massive skeleton uncovered in a collapsed mine in the Philippines. During their investigation, they find two chrysalises—one dormant and one shattered—leading to a trail that signals an impending earthquake towards Japan.
In Japan, the Janjira Nuclear Power Plant experiences strange seismic disturbances. Supervisor Joe Brody sends his wife Sandra and a group of technicians into the reactor. Unfortunately, disaster strikes when the reactor breaches, releasing radioactive steam that seals the team's fate, with only destruction left in its wake.
Fast forward fifteen years, Joe’s son Ford (played by Aaron Taylor-Johnson), a US Navy ordnance disposal officer, returns from military service to San Francisco. His homecoming is short-lived as he rushes to Japan after Joe is detained for trespassing within the Janjira quarantine zone. Joe is adamant about uncovering the truth behind the catastrophe, convinced that the seismic activity mirrors the readings from that tragic day.
Father and son manage to recover critical data from their old home but are soon captured and taken to a secure facility within the ruined plant. Here, they meet Serizawa and Graham, who join Joe in refusing to accept the notion of a natural disaster. Their situation escalates as a monstrous winged creature, which had been held captive, breaks free, unleashing chaos in its wake. This creature, known to feed on nuclear energy, poses a deadly threat, leading to Joe's injury and eventual death as the event is falsely reported as merely an earthquake.
In a desperate bid to track down the creature, the trio joins a US Navy task force led by Admiral William Stenz aboard the aircraft carrier USS Saratoga. The scientists unveil the shocking truth that a 1954 submarine expedition awakened Godzilla, a primeval alpha predator, fueling their quest for survival. The MUTO, which had escaped years ago, threatens to wreak even more havoc.
As events unfold, Ford is redirected to Honolulu, where the MUTO is discovered consuming a wrecked Russian nuclear submarine. Amid military assaults, the destruction shifts to Honolulu International Airport, where the MUTO skillfully uses electromagnetic pulses to render weapons ineffective. Just as hope seems lost, Godzilla arrives, triggering catastrophic chaos in Waikiki. After a brief confrontation, the MUTO flees, leaving devastation behind.
Meanwhile, a second, much larger MUTO emerges from a Nevada nuclear waste facility, revealing a surprising connection between the two creatures—they are communicating as they prepare to mate. As tensions rise, the task force projects a potential showdown near San Francisco. Despite the scientists' objections, Stenz sanctions a nuclear warhead strategy to lure the monsters away from the city, leading Ford to take charge as they endeavor to transport the explosives.
Tragedy strikes when the female MUTO derails their effort, consuming a warhead and leading the faithful team on a perilous journey into the heart of the city, where a nest full of eggs awaits. During the chaotic battle that ensues, Ford’s bravery sees him racing against time to disarm the warhead at the nest. With extraordinary courage, he destroys the nest, prompting the female MUTO's retreat, while Godzilla engages in a breathtaking showdown with the male MUTO.
As the titanic battles rage, Godzilla demonstrates its power, overcoming the male MUTO in a dramatic confrontation. Unfortunately, the female MUTO finds and brutally dispatches the team stationed on a boat, yet salvation comes when Godzilla, in an adrenaline-fueled revenge, obliterates the female by unleashing a torrent of atomic breath. This significant victory leaves Godzilla severely injured, collapsing in exhaustion.
The following day brings a bittersweet reunion for Ford as he locates his family within an emergency shelter. However, in the ruins of the once-thriving city, Godzilla, presumed lifeless, unexpectedly stirs, and with a concluding roar, it plunges back into the ocean, leaving behind a world forever altered.
