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King Maimai (キングマイマイ, Kingu Maimai) was a moth Kaiju from the TV series Return of Ultraman, he first appeared in episode 32.

Subtitle: Protean Monster (変幻怪獣, Hengen Kaijū)


Return of Ultraman

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 Spacium 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 Spacium Beam to destroy him but the monster quickly collapsed again, seemingly beaten.

Expressing sympathy for the monster, Jack stepped back, and prepared to leave, only for King Maimai to rise again! While Jack was attempting to take off, King Maimai began firing his webbing at Jack, paralysing him and rendering him unable to use his Ultra Bracelet to fight back by trapping his arms with the strong threads. Jack fought through the paralysis, and eventually managed to free his limbs to continue the fight. Jack threw his Ultra Bracelet into King Maimai's mouth which travelled into his stomach. The Ultra Bracelet then transformed into the Bracelet Bomb and exploded, killing King Maimai instantly.


  • King Maimai has two different sets of roars, both using modified monkey sounds from Ultraseven episode 44. His adult form uses slowed down versions while the larva form uses the same roars but reversed and further slowed down.
    • One of King Maimai's roars was later modified 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. Ryujin
Powers and Weapons
  • 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
King maimai-remove

Adult Stage

  • Height: 48 m
  • Weight: 25,000 t
  • Origin: Mt. Ryujin
  • Flight Speed: Mach 6
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 Maimai in Chibira-kun

King Maimai appears in the child friendly series, Chibira-kun.


  • His antennae are painted bright blue for this appearance.



King Mamai in Redman

King Maimai reappeared in the series Redman episode 33 where he met 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.

Redman (comic)

King Maimai makes an appearance in the ninth chapter of Redman as the main antagonist alongside a swarm of Big Liger. Their battle takes place near a tower like structure that the Liger are drawn to, where King Miamai ambushes Redman and stuns him with a roar, before trapping him in webbing. He proceeds to use his prehensile tail to drag and hurl the trapped Redman to the base of the tower. As King Maimai looms over Redman, he breaks out of the webbing and instantaneously stabs the kaiju in the neck before preceding to wipe out the colony of Big Ligers.


MaiMai Suit

King Maimai in "Woodman"

King Maimai appeared in the Woodman segments of the Japanese variety show Smile Pon!, where he fought a hero called Woodman. King Maimai, Red King, and Black King rampaged through the city where a young boy was watching the destruction. Through his own control box, he summoned a hero known as Woodman to battle the ferocious beasts. The kingly trio put up a good fight against the hero; however, they were eventually destroyed in a brawl to which Woodman disappeared after.


  • King Maimai's roar is heavily sped up Chandlar's roar.
  • In this short, King Maimai doesn't have his wings and is instead painted faded orange with big bright blue eyes and black antennae.



Return of Ultraman Kaiju
Takkong | Zazahn | Arstron | Sadola | Detton | Kingsaurus III | Gudon | Twin Tail | Gorbagos | Ghostron | Dangar | Stegon | Mognezun | Shugaron | Seamons | Seagorath | Eledortus | Terochilus | Bemstar | Sartan | Magnedon | Beacon | Gokinezura | Zanika | Vacuumon | Kupukupu | Kingstron | Zagoras | 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
Chibira-kun Kaiju
Chibira | Pochi Pochi | Goruba | Papagon | Mamagon | Gakinko | Oxley | Pip | Alien Perolynga | Gebagoro | Donar | Hare Hare | Pukaro | Miclas | Alien Icarus | Woo | Alien Baltan | Alien Zarab | Kanegon | Alien Mechara | Peguila | Agira | Dorako | Booska | Eleking | Gokidon | King Maimai | Chamegon
Redman Kaiju
Redman Darkron | Black King | Arstron | Garamon | Alien Icarus | Dorako | Peguila | Jirahs | Alien Baltan | Alien Goron | Gomora | Woo | Kanegon | Alien Mefilas | Sadola | Dangar | Ghostron | Gokinezura | Eleking | Telesdon | Nokogilin | King Maimai | Sartan | Bemstar | Beacon | Gronken | Zaurs | Kingstron | Stegon | Alien Mysteler | Zagoras | Kodaigon | Granadas | Plooma | Sasahiller | Alien Centaurus | Gudon | Red Killer | Draculas | Shugaron | Alien Bat | Zetton II
Unused Redman Kaiju Big Liger | Graygas | Sufinga