|First appearance:||Ultraman Tiga Episode 38 "The Mirage Monster"|
Subtitle: Odd Beast (奇獣 Ki-jū?)
- Height: 40 m
- Weight: 15,000 t
- Origin: Metropolice sky
Some sort of strange alien creatures, the Deathmon appeared in the Japanese skies one calm day. GUTS was quick to strike back at the invading forces, shooting down the monsters with whatever available weapons they had. By the time the attack was over, all that remained of these strange creatures were a series of photographs taken by the human forces.
- Dethmon is the second known monster defeated by GUTS without Ultraman Tiga's assistance (the first being Gakuma Alpha).
- Dethmon's appearance seems to resemble Alien Bira, right down to the tail.
Powers and Abilities
- Flight: Dethmon was capable of anti-gravity flight.