Maguma's name is the Japanese approximation of the word "magma." The name is somewhat ironic given that Maguma emerged from an iceberg in Antarctica, though this may be in reference to the dormant volcanism of the continent.
Despite canonically being a giant prehistoric reptile, Maguma resembles a giant walrus with elongated fore and hind limbs, green eyes, pale tusks, and smooth brown skin with no visible hair. Unlike real-life walruses, which possess vestigial tails, Maguma has no tail at all.
Maguma is a walrus-like creature which inhabited Antarctica tens of thousands of years ago and was reawakened due to changes in the climate caused by the ignition of the jet pipes. Despite its appearance, Maguma is actually a member of a species of reptiles, determined by examining samples of its blood under a microscope.
Maguma was disturbed from its hibernation by changes in the Antarctic climate caused by the ignition of the hydrogen jet fields on the continent used to propel the Earth out of the path of the rogue star Gorath. Irritated by the increased temperatures, Maguma attacked the power station of a jet field before returning to its home in a neighboring canyon. As the dysfunction of the fields and continued attacks would spell doom for the Earth, a VTOL aircraft was sent to dispose of Maguma. The VTOL strafed the walls of the canyon with its laser, causing Maguma to be buried in an avalanche. The creature broke free shortly afterward, only to be killed by direct hits from the aircraft's laser.
Due to possessing no extraordinary abilities, Maguma relies exclusively on its forelimbs to cause destruction. This is demonstrated when it uses one of its flippers to breach and destroy part of a jet pipe power station. Although not taken advantage of in its sole film appearance, Maguma also possesses sizable tusks which could be used to wreak further havoc.
Maguma can reach speeds of up to 200 kilometers per hour underwater.
Maguma displays at least a moderate measure of durability, surviving a forcible avalanche and being buried under a number of boulders and other chunks of rock.
Although surviving the first attempt on its life by way of burying, Maguma was less fortunate against the lasers of the VTOL and was quickly dispatched.
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Maguma attacked and destroyed North Korea in 2024, then began moving south and approaching Seoul, South Korea. The United States launched a tactical nuclear missile at Maguma and destroyed it, marking the first use of a nuclear weapon against a kaiju.
- Main article: Maguma/Gallery.
- According to an interview with Ishiro Honda, an early draft for the 1968 film Destroy All Monsters called for "all monsters" to appear. Early art for the film shows that Maguma was going to guard the Kilaaks' base along with Ebirah. However, they were replaced by Baragon and Varan, whose roles were reduced due to the poor conditions of their suits.
- Maguma was removed from the Brenco Pictures' American version of Gorath. The distributors found the character's appearance comical, mockingly dubbing him "Wally the Walrus." Test audiences agreed, even with the monster given Rodan's fiercer roar and shrouded in optically printed fog. Only a shot of Maguma's corpse buried in rubble remains in the American release.
- Tsuburaya Productions used the Maguma suit to depict the monster in episode 27 of . The suit was to be re-purposed a third time for Todogon, a walrus monster planned for the ultimately unproduced script The Negative 40 Degrees Battle.
- Maguma is referred to as a dinosaur in the script for Gorath. Because of this, Maguma is said to actually be a prehistoric reptile in the finished film and in official books, despite clearly resembling a walrus.
This is a list of references for Maguma. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: 
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