Plot: When a Japanese fishing boat is attacked by a flash of light near Odo Island, another ship is sent to investigate only to meet the same fate with few survivors.
On Odo Island, a village elder blames their poor fishing on a sea monster known as "Godzilla" and recalls that in earlier times girls were sacrificed to appease the giant sea monster.
Word gets out and a helicopter arrives on the island with curious, but skeptical, reporters.
Frightened natives perform a night-time ceremony to keep the monster away. However, that night, while the natives sleep, a storm arrives and something else comes with it, bringing death and destruction.
A boy sees the cause during the midst of the destruction.
The next day, the witnesses arrive in Tokyo. Archeologist Kyohei Yamane suggests that investigators be sent to the island.
On arrival, Yamane finds giant radioactive footprints, and a trilobite.
When an alarm sounds, the villagers arm themselves with sticks and various weapons and run to the hills, only to be confronted by Godzilla, who is revealed to be an enormous dinosaur-like creature. After a quick skirmish, the villagers run for safety and Godzilla heads to the ocean.
Yamane returns to Tokyo to present his findings and concludes that Godzilla was unleashed by a nuclear explosion.
Some want to conceal that fact, fearing international repercussions. Others say the truth must be revealed.
They prevail and Godzilla's origins are announced to the public. Ships are sent with depth charges to kill the monster.
When that fails, Godzilla appears again, frightening patrons on a party boat, and causing nationwide panic.
Officials appeal to Dr. Yamane for some way to kill the monster, but Yamane wants him kept alive and studied.
Meanwhile, Emiko, Yamane's daughter, decides to break off her arranged engagement to Yamane's colleague, Daisuke Serizawa, because of her love for Hideto Ogata, a salvage ship captain.
But Serizawa gives her a demonstration of a secret technology which horrifies her as she is sworn to secrecy while unable to break off the engagement.
That night Godzilla climbs from Tokyo Bay and attacks the city.
Though the attack is over quickly, there is much death and destruction.
The next morning, the army constructs a line of 40-metre (130 ft) tall electrical towers along the coast of Tokyo that will send 50,000 volts of electricity through Godzilla, should it appear again.
Civilians are evacuated from the city and put into bomb shelters. As night falls, Godzilla does indeed attack again.
It easily breaks through the electric fence, melting the wires with its atomic breath.
A bombardment of shells from the army tanks has no effect. Godzilla continues its rampage until much of the city is destroyed and thousands of civilians are dead or wounded.
Godzilla descends unscathed into Tokyo Bay, despite a squadron of fighter jets' last-ditch attack.
The next morning finds Tokyo in ruins. Hospitals overflow with victims, including some with radiation poisoning.
Witnessing the devastation, Emiko tells Ogata about Serizawa's secret Oxygen Destroyer which disintegrates oxygen atoms and the organisms die of a rotting asphyxiation while accidentally creating a new energy source.
She hopes that the two can persuade Serizawa to use it to stop Godzilla.
When Serizawa realizes Emiko has betrayed his secret, he refuses and ends up giving Ogata a minor head wound during the resulting fist fight.
As Emiko treats Ogata's wound, Serizawa apologizes, but he refuses to use the weapon on Godzilla, citing the public bedlam his weapon could cause.
Then a newscast shows the devastation Godzilla has caused.
Choirs of children are shown singing a hymn. Finally realizing this, Serizawa decides he will use the weapon once as he then burns his life's research for the good of humanity.
Emiko breaks down and cries when she sees this, understanding that Serizawa will sacrifice more than his life's work to stop Godzilla.
A navy ship takes Ogata and Serizawa to plant the device in Tokyo Bay.
They don diving gear and descend into the water, where they find Godzilla at rest.
Ogata returns to the surface as Serizawa activates the device, watching Godzilla die before cutting off his oxygen cord so that the secrets of the Oxygen Destroyer will die with him.
A dying Godzilla surfaces and lets out a final roar before sinking to the bottom where it completely disintegrates, save for its skeleton.
Although the monster is gone, those aboard ship mourn the unexpected loss of Serizawa.
Godzilla's death has come at a terrible price and Dr. Yamane believes that if mankind continues to test nuclear weapons, another Godzilla may appear again one day.
If you love Godzilla your like this movie.
Also here is a good review of the movie done by James Rolfe