|Home world:||Planet Earth|
|First appearance:||Neo Ultra Q Episode 6: "The Extremely Smelly Island" (2013)|
Subtitle: Stench Monster (悪臭怪獣, Akushū Kaijū?)
- Height: 9.3 m
- Weight: 93 t
- Origin: Earth
Neo Ultra Q
Sedegan was a lone monster who sat on an island filled with sweet smelling plants. A greedy woman washed up on his shore and Sedegan tried to be friendly, only to have the girl steal his plants and call the large nosed monster smelly. When she returned one day, the Japanese military raided the island and open fire on Sedegan, killing him and leaving the woman in misery.
- Design: Masayuki Goto
- Sedegan's suit pays homage to Neronga and Red King.
- Despite the official height, Sedegan is often shot appearing to be barely 4 meters tall.
Powers and Abilities
- Healing Mucus: Sedegan can emit mucus from his nose that can heal small wounds in seconds.