The Underground Men (地底人 Chiteijin) were introduced in Ultraman 80.
Subtitle: Underground Kingdom People (地底王国人 Chitei Ōkoku-jin)
- Height: Humanlike
- Weight: Humanlike
- Origin: Underground King Yue months
The Underground Men were a seperate species of humans living as far back as the Ice Age. The Underground Men where the same size in population as humans (4 billion). They were found shortly after the Underground Men launched a satellite to block out sunlight, the UGM chased them into a cave which turned out to be the entrance to their kingdom. The UGM awoke to see the subterraneans aiming rifles at them, but they were stopped by their leader, Queen Einus. She told them the history of the Underground Men, and Takeshi promised to her that they could way for them to live together. The rest of UGM tried to persuade the leaders of Japan to allow it, and succeeded. One official, driven to an insane state to destroy them, ordered an attack on the satellite and the Underground Men. The activity awakened the monster Gomora who caused the underground world to crumble apart, while the Underground Men and their princess retreated far underground.
- They may or may not be related to the original Underground People of Ultraman.
- Powers and Weapons
|Ultraman 80 Kaiju & Seijin|
|Crescent | Gikogilar | Hoe | Zandrias | Alien Bam | Mechagiras | Abdolaars | Noiseler | Tabra | Gabishale | Jakki | Aruma | Zuruzla | Medan | Alien Vibros | Gora | Alien Gorgon | Saramandora | Zarudon | Myu | Devilon | Alien Ruria | Sawako Hoshi | Lavras | Daron | Gymaira | Gaus | Okorin Ball | Alien L85 Zuckal | Gamos | Underground Men | Queen Einus | Gomora II | Amoeza | Alien Fantas | Robo-Fo | Argon | Akuzone | Gera | Alien Argo | Val | Zakira | Cathy | Alien Zatan | Zatan Silver | Zora | Barrack Ship | Gazera | Angoras | Fire-Draco | Kuwaganda | Baltan Warship | Alien Baltan V | Ghostdon | Tetsuon | Space Plant | Jihibikiran | Barebadon | Zurasuimar | Alien Galagala | King Galtan | Delusion Ultraseven | Alien Baltan VI | Marjin | Red King III | Glovusk | Idantenran | Plazma | Minazma | Margodon|