|Home world:||Yapool's Dimension|
|First appearance:||Ultraman Ace Episode 34: "A Chouju Dances on an Open Rainbow" (1972)|
Subtitle: Rainbow Super-beast (虹超獣 Niji Chōjū?)
Kaiteigagan was a choju composed of sea shells created to destroy boats off the coast. Kaiteigagan first appeared in the middle of the ocean were it was attacked by TAC's fighter jets. Wile not being able to kill it, they did manage to drive it back to under the waves. Kaiteigagan, later, reappeared in the coast of a beach. TAC once again attacked it with fighter jets. However this time, Kaiteigagan fled to land! Hukuto quickly transformed into Ultraman ace to do battle with the super beast. While Kaiteigagan tried its hardest and used all the super powers at it's disposal, It was no match for the hero and was beat into submission. After a massive beatdown, Ace killed the choju with his Metallium Ray, blowing it up.
- Kaiteigagan's roar is a reused Varricane roar.
- Kaiteigagan is one of the monsters that make up Beryudora's Right Arm in Mega Monster Battle: Ultra Galaxy Legend The Movie.
Powers and Weapons
- Adept Swimmer: Being an aquatic monster, Kaiteigagan can swim at moderate speeds.
- Gas: Kaiteigagan can emit a gas from his mouth.
- Stun Ray: Kaiteigagan can release a purple ray from his mouth that can stun enemies.
- Missiles: Kaiteigagan can fire missiles from its mouth in rapid succession.
|Ultraman Ace Kaiju & Seijin|
|Verokron | Yapool | Chameleking | Vakishim | Garan | Aribunta | Giron Man | Brocken | Alien Metron.Jr | Doragory | Muruchi II | Gammas | Zaigon | Alien Antira | Unitang | Sabotendar | Barabba | 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 Hipporito | 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 | Fubigirara | Onidevil | Gasegon | Daidarahoshi | Hanzagiran | Verokron II | Yapool Woman | Univerlages | Aquarius | Alien Revole | Signalion | Geegon | Alien Simon | Jumbo King|