King Maimai
Home world: Planet Earth (Nebula M78 Universe)
First Appearance: Return of Ultraman episode 32 "Decisive Battle Under The Setting Sun" (1971)
Latest Appearance: Redman (1972)
Height: 40 ~ 48 m
Weight: 15,000 ~ 25,000 t
Category: TBA
Affiliation: None
Roar(s): TBA
King Maimai (キングマイマイ Kingu Maimai) was a kaiju that appeared in the television series Return of Ultraman episode 32.

Subtitle: Protean Monster (変幻怪獣 Hengen Kaijū)


Return of Ultraman


King Maimai Anatomy

Even as in his larva stage, King Maimai was a massive behemoth buried frozen deep underground but known in legends by the people of the area. He was discovered slumbering underground by a mining crew who accidentally disturbed the ancient titan. The cave flooded, killing many but later, a survivor explained what happened to Hideki Go when he was sent by MAT to investigate. Throughout the day, his stirring caused small tremors to the nearby village. The next day, Go was lead into the abandoned mining tunnels to search for the monster. The Earth began to shake slightly from the movements of the titan that was beginning to stir but even though the tremors quickly stopped, Go’s guide was terrified . Go soon came upon the cavern that had opened when King Maimai had awakened from his hibernation and went in to investigate, while his guide stayed behind due to fear of King Maimai. Go soon discovered the monster frozen in ice, likely for centuries. The yells of his guide accidentally fully awakened the giant up from its hibernation and King Maimai trapped Go as he tore free from his prison. MAT was quick to attack the monster as he tore the ice from his body but he merely fired his explosive gas at them, though failed to do much damage. Their attacks, as well as attacks by the locals, seemed to take their toll on the monster, blowing his arm off. But the monster was far from dead and his skin split straight down the middle, emerging as in his insect-like adult form, healing all the damage that had been done. Go transformed to Ultraman Jack and quickly attacked the monster with the Specium Beam but the monster flew up and dodged. He managed to down the monster and tried to attack it, only for its tail to constrict his neck and throw him off. Recovering, he broke the monster’s tail and tied its wings up. King Maimai tried to stand, causing Jack to prepare the Specium Beam to destroy him but the monster quickly collapsed again, seemingly beaten. Seeing King Maimai couldn’t continue, Jack couldn’t bring himself to kill it and turned to leave. However, King Maimai was just pretending defeat and quickly launched to his feet. He quickly began wrapping the Ultraman up in his webbing, leaving Jack helpless. Unable to move, Jack's timer began to blink faster and faster. Jack managed to fight through the paralysis and spin around at high speeds to free himself and then threw the Ultra Bracelet down King Maimai's mouth. In the monster’s gut, it turned into a bomb which Jack detonated, ending King Maimai's reign in a gigantic explosion.


  • King Maimai's roar are lower pitch Bemstar roar.
  • King Maimai's roar was later used for Birdon.
  • King Maimai, in adult form, is one of the monsters that appears as a picture on the wall of Yuriko's room in episode 18 of The Ultraman.


Larva Stage

Larva Stage


  • Height: 40 m
  • Weight: 15,000 t
  • Origin: Mt. Divine Dragon

Powers and Abilities

  • Burrowing: King Maimai Larva can burrow through the earth at moderate speeds.
  • Explosive Gas: The King Maimai Larva can fire clouds of explosive gas from his rear end.

Adult Stage

Adult Stage


  • Height: 48 m
  • Weight: 25,000 t
  • Flight speed: Mach 6 (Adult)
  • Origin: Mt. Divine Dragon

Powers and Weapons

  • Flight: Using the two massive sails on his back, King Maimai can fly at high speeds.
  • Constricting Tail: King Maimai’s tail is long and capable of wrapping around enemies and choking them.
  • Paralyzing Webbing: King Maimai can emit a stream of webs from his mouth capable of paralyzing Ultras temporally.

Other Media


King Mamai


King Maimai reappears in the series Redman episode 33 where he meet up with Eleking and became friends. Before long, Redman showed up and fought up close after Eleking fired his gas grenades at him. After a seemingly close fight, after throwing both monsters to the ground, the hero killed them both by throwing his Red Arrows at them.

  • King Maimai looks a little different. He is green colored instead of black.


King Maimai appears in the child friendly series, Chibira Kun.


  • His antenae are painted bright blue for this appearance.

Figure Release Information





Ultraman Jack vs King Maimai

Ultraman Jack vs King Maimai

Return of Ultraman Kaiju & Seijin
Takkong | Zazahn | Arstron | Sadola | Detton | Kingsaurus III | Gudon | Twin Tail | Gorbagos | Ghostron | Dangar | Stegon | Mognezun | Shugaron | Seamons | Seagorath | Eledortus | Terochilus | Bemstar | Sartan | Magnedon | Beacon | Gokinezula | Zanika | Vacuumon | Kupukupu | Kingstron | Zagorath | Nokogilin | Gronken | Varricane | Yadokarin | Oxter | Plooma | Alien Zelan | King Maimai | Alien Mates | Muruchi | Leogon | Pris-Ma | Draculas | Re-Seagorath | Re-Bemstar | Black King | Alien Nackle | Alien Varduck | Alien Black | Snowgon | Alien Baltan. Jr | Builgamo | Alien Stora | Paragon | Alien Grotes | Kodaigon | Granadas | Alien Centaurus | Robonez | Alien Cygnus-61 | Alien Messie | Alien Zoole | Red Killer | Femigon | Yametaranese | Sasahiller | Alien Ateria | Alien Mysteler | King Bockle | Alien Bat | Zetton II
Redman Kaiju & Seijin
Darkron | Black King | Arstron | Garamon | Alien Icarus | Dorako | Peguila | Jirass | Alien Baltan | Alien Goron | Gomora | Woo | Kanegon | Alien Mefilas | Sadola | Dangar | Ghostron | Gokinezula | Eleking | Telesdon | Nokogilin | King Maimai | Satan | Bemstar | Beacon | Gronken | Zaurs | Kingstron | Stegon | Alien Mystellar | Zagoras | Kodaigon | Granadas | Plooma | Sasahiller | Alien Centaurus | Gudon | Red Killer | Draculas | Shugaron | Alien Bat | Zetton II
Big Liger | Gureigasu | Sufinga

Chibira-Kun Kaiju & Seijin
Agira | Alien Icarus | Alien Mechara | Alien Perolynga | Alien Zarab | Booska | Chamegon | Chibira | Dorako | Eleking | Getdata | Gokidon | Kanegon | King Maimai | Miclas