|Home world:||Planet Earth (Cosmos Universe)|
|First appearance:||Ultraman Cosmos Episode 6: "Monster Fishing" (2001)|
|Latest appearance:||Ultraman Saga (2012)|
Subtitle: Underground Monster (地中怪獣, Chichū Kaijū?)
- Height: 56 m
- Weight: 64,000 t
Mogrudon was a giant mole monster who was disturbed of his sleep by electromagnetic waves caused by underground construction. In hopes of silencing the noise, Mogrudon tried to stop the construction with his long tail on the surface. EYES was quick on the scene to try and drive off Mogrudon's presence but his tail retracted back into the ground before any threat could be made towards the monster. EYES then tried "fishing" the monsters out from hiding by using a giant hooked cord, like a fishing rod and successfully managed to pull Mogrudon's entire body to the surface. Unfortunately, Mogrudon hit a power plant while being dragged to the surface and EYES was out of commission, leaving Musashi to transform into Ultraman Cosmos to deal with the monster. Despite Mogrudon using his illusionary chest and tail, Cosmos fought back and incapacitated Mogrudon by tying him up with his own tail before putting the monster to sleep with the Luna Light (also known as the Full Moon Rect).
Mogrudon was then sent to Kapuya Island where he would live with other monsters that's rampages were stopped by Cosmos. During his time on the island, Mogrudon made good friends with the monster Bolgils. During Chaos Darkness's final attack on Earth, Mogrudon(as well as Lidorias and Bolgils ) assisted Ultraman Cosmos in weakening Chaos Darkness long enough for Ultraman Cosmos to purify the evil entity once and for all.
- Mogrudon shares the same subtitle as Magular.
- The Mogrudon suit was on display at Ultraman Land.
- Mogrudon and his first appearance in Ultraman Cosmos was referenced by Hikaru Raido and Ultraman Taro in New Ultraman Retsuden episode 18 to compare Ultraman Ginga's Ginga Comfort with Ultraman Cosmos's Full Moon Rect.
- Mogrudon pays homage to Mongular from Ultra Q.
Mogrudon reappeared in the film, Ultraman Saga.
Several Mogrudon, are seen with other monsters on an unknown island (presumably Kapuya Island) or Planet Juran).
Powers and WeaponsEdit
- Burrowing: Being a mole monster, Mogrudon can burrow at high speeds.
- Tail: Mogrudon's tail is nearly 5x his body length, he can use it to ensnare, batter, or lure opponents on the surface while he himself is underground.
- Mesmerizing Chest: If stared at long enough, Mogrudon's chest design can temporarily confuse his opponents by conjuring illusions.