Gasgegon (ガスゲゴン Gasugegon) was a Terrible-Monster that appeared in the TV series, Ultraman Ace. He appeared in episode 45.
Subtitle: Gas Terrible-Monster (ガス超獣 Gasu Chōjū)
Gasgegon was a monster from space, possibly one of Yapool's Terrible-Monster. He was concealed inside a black cloud and descended on a space craft. TAC was now aware of the disappearance and intended to investigate for signs of trouble. A boy was looking at his new telescope until he saw a red light headed for one of the oil tanks. TAC detected the force and it was located in the industrial area. After they found the monster with a Geiger counter, their jets fired onto a particular tank. After a few shots, Gagsegon came out! TAC did not want to cause a nuclear explosion so they had to improvise. TAC used freeze bombs on the Terrible-Monster and it seemed to work until Gasgegon used his own heat to melt the ice. Hokuto was shot down by the Terrible-Monster and became Ultraman Ace to fight Gasgegon. Gasgegon proved to be a tough fighter, but Ace eventually sneaked from behind and carried him into space. There, TAC shot their new laser to blow up the Terrible-Monster without harming any civilians.
- Gasgegon is one of the monsters that makes up Belyudra's body in Mega Monster Battle: Ultra Galaxy Legends The Movie.
- Height: 78 m
- Weight: 27,000 t
- Origin: Yapool's Dimension, Space
- Powers and Weapons
- Smoke Cloud: Gasgegon uses a cloud of smoke to descend on planets.
- Radiation: Gasgegon is highly radioactive and uses this ability to heat up when frozen.
- Flame: Gasgegon can fire streams of fire from his mouth.
- Toxic Gas: Gasgegon can fire a toxic gas from his mouth.
|Ultraman Ace Kaiju|
|Verokron | Yapool | Chameleking | Vakishim | Garan | Aribunta | Giron Man | Brocken | Alien Metron Jr. | Doragory | Muruchi II | Gammas | Zaigon | Alien Antira | Unitang | Sabotendar | Baraba | Ace Killer | King Crab | Cattle God | Cowra | She-Devil | Hotarunga | Black Pigeon | Android Couple | King Kappa | Zemistlar | Aprasar | Aprasar Fairy | Space Mask | Black Satan | Giant Yapool | Mazaron Man | Yojo | Mazarius | Alien Orion | Sphinx | Alien Hipporit | Lunaticks | Undergroundmon | Gitagitanga | Red Jack | Baktari | Coakes | Bad Baalon | Kaiteigagan | Dreamgillas | Soundgillar | Machless | Snowgiran | Namahage | Alien Fire | Firemons | Alien Steal | Kaimanda | Shishigoran | Iceron | Woo II | Fubugirara | Onidevil | Gasgegon | Daidarahoshi | Hanzagiran | Verokron II | Yapool Woman | Univerlages | Aquarius | Alien Revole | Signalion | Geegon | Alien Simon | Jumbo King|