Maguma's name literally means "magma", which is odd as Maguma is weak to high temperatures.
Maguma looks like a giant brown walrus with yellow eyes, pale tusks, smooth skin, and no visible hair other than its whiskers. Maguma also lacks a tail.
Trapped for centuries in an icy tomb, the massive walrus was awoken from its ancient slumber when gigantic rockets were implanted on the North Pole to move the Earth away from the oncoming rogue star Gorath. Awakened, Maguma lashed out at the base and damaged it before retreating back into its home valley. Knowing something was going on that involved a ravenous monster, a VTOL craft was dispatched to handle the creature. The ship buried the walrus under hundreds of tons of rock, but even this couldn't kill the monster.
Maguma rose up and charged the small humans before it. The group of three retreated back to their ship and then to the safety of the sky. Maguma snarled again before the craft unleashed more streams of searing energy on it. Unable to cope with such an attack, Maguma fell to its side and breathed its last breath.
Maguma's roar was basically elephant trumpeting sounds, but was deepened and slowed down.
- Just like Ebirah, Maguma was originally of Godzilla's allies for Destroy All Monsters, but was replaced, by Gorosaurus, Minilla and Anguirus.
- It is thought that Tsuburaya Productions, who last used the suit, damaged it beyond repair when Maguma was used as the Ultra Q monster Tadora.
- Maguma's roar was later used for the Ultraman 80 kaiju Salamandora.