Muruchi appeared in the 1971 TV series called Return of Ultraman. A male salmon-like monster that is biological weapon with smooth blue tech financial skin created by Alien Mates, Muruchi was a weapon created in case negotiations with Earth would become rough. Alien Mates kept him contained in his UFO, which he had buried underground due to the sheer amounts of pollution. However, Alien Mates was tragically shot and killed by a police officer in an angry mob (who were trying to kill Alien Mates too,) Muruchi becomes angry and arose from underground and caused havoc, believing that the planet was against Alien Mates due to his murder. Goh transformed into Ultraman Jack and both he and Muruchi fought in a local refinery plant until he destroyed Muruchi with a single use of the Specium Ray.