Gorgo was later discovered to be an infant Gorgosaurus,a fictional species,later named Ogra. Ogra followed its scent trail and arrives in London. The Ogra destroyed everything in her path and is barely stopped, if at all, by the British Armed Forces. The British employ tanks, missiles, battleships, and even electrical transformers to dispatch Ogra. After coming upon her baby, Gorgo and Ogra leave London peacefully.
Armored Hide - Gorgo's skin is tough and durable, proving all but invulnerable to most damage.
Claws - Gorgo is equipped with sharp claws on her massive hands,with which to scratch and bash around her opponents.
Swimming - Gorgo is an amphibious kaiju, as much at home in the water as on land.
Weaknesses: None known.
Height: 60 meters
Weight: 27,500 metric tons
As the film commences, Captain Joe Ryan is salvaging for treasure off the coast of Ireland, when a erupts, nearly sinking his ship. Ryan and his first officer, Sam Slade, take the ship to Nara Island for repairs. As they enter harbour, they discover the floating carcasses of marine animals, the first hint that something dangerous was awoken by the volcano eruption.
Ryan and Slade consult the harbour master, who also has archeological pretensions: he has been salvaging a in the harbor. Some of his men have disappeared mysteriously; it turns out that one has died of fear. After dark, a monstrous creature surfaces, attacks a group of fishermen, then comes ashore to wreak havoc on the island. This -like creature is supposedly 65 feet tall. The people of the island finally drive it off.
Ryan and his crew manage to capture the monster and haul it aboard their ship, tying it to the deck. Soon, university scientists arrive on Nara, hoping to collect the monster for study, but Ryan has been offered a better deal by the owner of a circus in London. When the ship arrives in London, the circus owner names it "Gorgo", after a name in Classical mythology. It is exhibited to the public in Battersea Park.
The scientists examine Gorgo, and conclude that he is not yet an adult, and that his mother must be nearly 200 feet tall. On that note of foreboding, we cut to Nara Island as Gorgo's mother ("Ogra") attacks. Ogra trashes the island, sinks a Royal, and resists attack from other warships. Later, Ogra comes ashore in London, still looking for her son, goes on a rampage and , despite being bombarded by tanks and infantry it continues. Jets attack Ogra, but with no effect. Having demolished much of London, Ogra rescues Gorgo, and both mother and son return to the sea.
- A fan-fiction story in the magazine G-fan was written about Gorgo. Taking a few years after the movie Gorgo and his mother battle the monster Reptilicus with the two Gorgo's ultimately winning the battle.
- There was an actual prehistoric creature named Gorgosaurus, a theropod dinosaur and distant relative of Tyrannosaurus, that lived in the Late Cretaceous Period.
- Gorgo was a novel before becoming a film.
- The creature and his mother were mocked on the show Mystery Science Theater 3000
- There's a Japanese action figure based on Ogra.