|Home world:||Planet Earth (Fireman universe)|
|First appearance:||Fireman episode 1|
|Latest appearance:||Fireman episode 2|
Subtite: Three-angle monster (三本角怪獣, Sanbondzuno Kaijū?)
- Height: 59 m
- Weight: 39,000 t
- Origin: AOE Peninsula
Dorigon and her brother, Dorigorus where 100 million year old Triceratops and they hibernated in the AOE Peninsula, the Triceratops-es wake up from the there hibernation every 1 million - 1 thousand years making 1973 the year they wake up. While they woke up, meteors landed on their region giving them special powers.
A couple hours later and Dorigon was swimming in the see until she found the Ocean Marine Institute's submarine, Sea Marine and tried to destroy it only for a Ocean Marine member to contact the Air Force Unit 12 to defeat Dorigon. Dorigon used her Heat Ray to destroy everything in her path, even the Air Force had no match! As Fireman sends Daiskue the Cretaceous Fire Stick, Daiskue transforms into Fireman to end Dorigon's rein! After Dorigon seemed defeated she used her Energy Net to trap Fireman. Dorigon decided to swim back to the Aoe sea only for Fireman to chase her leaving Fireman with his color timer blinking. Then out of nowhere Fireman jumped from the rumble and chopped Dorigon's horns off! With Dorigon weakened, Fireman used Fire Flash to kill the monster once and for all only for Dorigon's brother to rise.
- Dorigon's design pays homage to the Toho Monster Baragon.
- Dorigon posseses the roar of the Daiei monster, Jiger.
- In Ultraman Leo Episode 9, Dorigon makes a appearance as a statue at the Monster Army Show.
Powers and Weapons
- Energy Blast: Dorigon can fire quick, yet very devastating energy blasts from its maw.
- Energy Net: Dorigon can shoot streams of energy from his head horns, to ensnare his intended opponent.
- Shock Wave: Starting out with a blinding flash of light from his horns, Dorigon can unleash shock waves of blistering power. it is strong enough to shred planes in mid-flight, or shatter the ground like a earthquake.
- Heat Ray: Dorigon can fire a heat ray from his mouth.
- Adept Swimmer: Dorigon is a adept swimmer.
|Fireman Kaiju & Seijin|
|Dorigorus | Dorigon | Stegorus | Alien Meteor | Jurasairous | Planet Gomerus | Spacer | Kinokurages | Twin Tail | Kumagorus | Gudon | Stegorus II | Nerogiras | Alien Baranda | Baranda V | Scoradon | Alien Barogu | Terasaurous | Dorango | Chiranodan | Lanosaurus | Terasaurous II | Long Neck | Alien Sulpher | King Zauras | King Zauras II | MukuMuku | Makurosaurous | Gagango | Double God | Death Torosaurus | Alien Green | Green Giller | Haromongan | Destrosaurous | Alien Virenus | Gadorasaurous | Blacker | Black Satan | Alien Emusa | Bemutan | Devilsaurus | Bemusa King | Speguzu | Speguzu Jr. | Dark Mander | Planetship X|