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Geronimon (ジェロニモン Jeronimon)[1] is a Kaiju from Ultraman, appearing in episode 37. A mysterious monster who was at one point rumoured to be the leader of all of Earth's natural monsters, Geronimon is also an extremely capable necromancer, able to revive any monster he chooses using a strange power only he has access to. Angered by Ultraman and the SSSP constantly destroying the monsters under his command, Geronimon battled Ultraman in a duel, only to be defeated himself from a combination of the hero and humankind.

Subtitle: Monster Chief (怪獣酋長 Kaijū Shūchō)



Geronimon's name comes from the Geronimo, the chief of the Chiricaha tribe of the Apache Native Americans, hence his nickname as the Monster Chief and the numerous feathers decorating his head.



Geronimon was a incredibly powerful monster who was reputed to be the leader of the Earth monsters. He was angered by the Science Patrol and Ultraman for constantly killing his monsters, so, in revenge he, revived Telesdon, Dorako, and Pigmon as a warning to the Earth. Re-Pigmon revealed that Geronimon's plan was to revive 60 more monsters in order to take over the planet and defeat Ultraman with this army of monsters.

After Telesdon and Dorako were killed by the Science Patrol (Re-Pigmon was killed by Re-Dorako), Geronimon appeared from within a mountain and attacked the Science Patrol himself. Ultraman eventually showed up, rescuing the Science Patrol and confronting the Monster Chief. Geronimon used his razor-sharp feathers to attack Ultraman and chase him into the sky, but Ultraman destroyed most of the them and then he pounced on Geronimon, restraining the monster using his knees. Ultraman then enraged Geronimon by tearing out all the feathers on his head. Geronimon tried to use his Anti-Gravity Mist on Ultraman, but the hero redirected the mist with his Ultra Barrier, lifting Geronimon into the air. Ultraman held Geronimon steady as his colour timer started to blink, and the monster was shot and killed by the Science Patrol.


  • Suit actor: Teruo Aragaki
  • Geronimon's roar is a modified roar of Mongula (from Ultra Q), which in turn were heavily slowed down lion roars.
  • Geronimon was originally suppose to revive the monsters, Red King and Gabora, but due to the condition of the suits (both being overused), they were replaced by Telesdon and Dorako.
  • Stage show suits of Geronimon usually depict its feathers with strips of fabric instead, likely to make the suit easier to maintain.
  • In at least one stage show, Geronimon sides with Ultraman Zero to fight a rampaging Nosferu.




  • Height: 40 m
  • Weight: 30,000 t
  • Origin: Oiwayama
Powers and Weapon​s
  • Telekinesis: To make the motion of his Feather Shurikens more unpredictable, Geronimon can direct these feathers using Telekinesis, simply by waving his hands. Geronimon is also able to use this ability in conjunction with his Anti-Gravity Mist technique.
  • Feather Shot (フェザーショット Fezā Shotto): The feathers lacing Geronimon's tail and back are capable of launching out with a mere flick, which it then redirects using its psychic powers to effectively transform them into projectiles.
  • Anti-Gravity Mist: Geronimon can expel a levitating, anti-gravity mist from his mouth, capable of lifting up humans and giant monsters into the air.
  • Resurrection: Geronimon is capable of using necromancy to resurrect up to sixty monsters from the dead, sometimes modifying them from their original forms.
Ultraman Fighting Evolution Rebirth
  • Fireballs: When bringing his hand together, Geronimon can launch purple, missile-strength fireballs from his palms.
  • Psychic Power: Geronimon possesses powerful psychic abilities, enough to levitate an opponent.

Cyber Geronimon

Cyber Geronimon

Using the data of Geronimon's Spark Doll, a cybernetic/artificial version would be created and contained in a Cyber Card, namely Cyber Geronimon (サイバージェロニモン Saibā Jeronimon).

  • Height: 40 m
  • Weight: 80,000 t
  • Origin: Xio Headquarters
Powers and Weapons
  • TBA

Other Media

Ultraman Fighting Evolution Rebirth

Geronimon, as seen in Ultraman Fighting Evolution Rebirth.

Ultraman ventures to a frozen arctic wasteland. While there, Ultraman is ambushed by a revived Geronimon, who is trapped inside of a giant icicle. Shortly after, Geronimon breaks out of the icicle and attacks Ultraman himself. After fighting him three times, Geronimon collapses, dead once again. Later on in the story, the feathers on his head are used as an extra body-part for EX Tyrant. Ultraman Fighting Evolution Rebirth

Ultraman Story 0

TBA Ultraman Story 0




Ultraman Story 0



Ultraman Kaiju
The Birth of Ultraman Kanegon | Garamon | M1 | Red King | Alien Baltan | Antlar | Chandlar
Ultraman Bemular | Alien Baltan | Neronga | Ragon | Greenmons | Guesra | Antlar | Red King | Chandlar | Magular | Suflan | Pigmon | Gabora | Jirahs | Gango | Mummy Man | Dodongo | Pestar | Gamakugira | Gavadon | Alien Baltan II | Bullton | Alien Zarab | Aboras | Banila | Hydra | Kemular | Underground People | Telesdon | Jamila | Gubila | Guigass | Dorako | Red King II | Suflan II | Gomora | Dada | Goldon | Woo | Keronia | Zumbolar | Alien Mefilas | Giant Member Fuji | Alien Baltan III | Kemur II | Alien Zarab II | Skydon | Seabozu | Zaragas | Re-Pigmon | Re-Dorako | Re-Telesdon | Geronimon | Keylla | Saigo | Alien Zetton | Zetton
Ultraman Fighting Evolution Kaiju
Ultraman Fighting Evolution Alien Baltan | Gomora | Dada | Zetton | Eleking | Alien Metron | King Joe | Ace Killer | Alien Magma
Ultraman Fighting Evolution 2 Alien Baltan | Dada | Alien Magma | Tyrant | Yapool | Bemstar | Ace Killer | Giras Brothers | Zetton | King Joe | Gomora
Ultraman Fighting Evolution 3 Alien Baltan | King Joe | Bemstar | Ace Killer | Tyrant | Alien Magma | Giras Brothers | Silverbloome | Gomora | Zetton | Dada | Fire Golza | Geozark | Zoiger | Gatanothor | Sufume | Reicubas | Gan-Q Code №00 | Gan-Q Code №01 | Zoruim | Gloker Pawn | Gloker Bishop | Giga Endra | Red King | Gudon | Twin Tail | Vakishim | Evil Tiga | Ace Robot | Delusion Ultraseven | Imit-Ultraman Dyna
Ultraman Fighting Evolution Rebirth Bullton | Gomora | Red King | Eleking | EX Eleking | Kyrieloid | Chaos Kyrieloid | Tyrant | EX Red King | EX Gomora | Bullton II | Phantom-Ultraman Agul | EX Tyrant | EX Tyrant II | Geronimon | Alien Baltan | Waroga | Chaos Waroga | Alien Mefilas | Chaosroid T | Chaosroid S | Chaosroid U | Neo Chaos Darkness | Neo Chaos Darkness II
Ultraman Fighting Evolution 0 Alien Baltan | Zetton | Eleking | Black King | Vakishim | Alien Hipporit | Alien Temperor | Alien Babarue