Subtitle: Poison Flame Monster (毒炎怪獣 Doku En Kaijū)
- Height: 57 m
- Weight: 45,000 t
- Origin: Summoned by Alien Seger Aoi
Segmeger is a planet-invading monster used by Alien Seger Aoi.
Segmeger first fought Ultraman Taiga, poisoning his left arm with Seger Flame, which transferred the damage over to Hiroyuki Kudo as well. Taiga destroyed it using the Strium Blaster after a brief fight, but Hiroyuki had to get a cast over his arm afterward. Alien Damara then came into the EGIS base to warn them that his planet was destroyed by Segmeger, and that it would continue to return as long as its summoner was still around.
Aoi summoned Segmeger again after she thought that Pirika Asahikawa, whom she met recently and became friends with for a short time, was spying on her. Taiga, Fuma and the Titas fought against Segmeger but their efforts were insufficient even when Taiga blasted it the Mons Beam Ray. Ultraman Fuma also had a difficult time with Segmeger and switched with Ultraman Titas, who chopped its tail off. Titas was sprayed with Segmeger's poison blood that came gushing out of its wound, disorienting him, which allowed Segmeger to knock him down. Pirika managed to convince Aoi to do the right thing, so she used her crystal ball to give up her life force, which then entered Titas and healed him. Titas then pounded Segmeger and finished it off with the Electro Buster, turning it into a ring that Hiroyuki collected.
- Designer: Daisuke Inomoto
- Suit Actor: Hiroyuki Arai
- Although the effects of Segmeger's attacks and poison were carried over to Hiroyuki, they do not seem to be shared between the Tri-Squad members for some reason.
- Its name is possibly derived from Egyptian goddesses name, Sekhmet and Meretseger.
Ultraman Taiga The Movie: New Generation Climax
Segmeger is set to reappear in the movie.
Powers and Weapons
- Seger Flame (セゲルフレイム Segeru Fureimu): Segmeger can unleash purple poisonous flames from its mouth. It produces a purple glow where the target is hit but recedes shortly after, leaving a purple gel-like substance.
- Lightning Ray: Segmeger can fire a lightning ray from its mouth. Can also be used to form a barrier.
- Poisonous Physiology: Segmeger's body naturally produces poisons, and can also use its blood to disorient its attacker should its appendages be dismembered.
- Tail: Segmeger can wrap its tail around an enemy to hold them in place.
Segmeger's poisons are neutralized by its own summoner's life force.