He was voiced by Hiroshi Shirokuma and portrayed by suit actor Yasuhiko Imai.
The Golem Megid was originally on Earth summoned by Regiel from the Gansekiou Golem Alter Ride Book. Upon its creation, the Golem Megid used a blank Alter Ride Book Regiel gave it by opening it in the middle of the city to transport a portion of it in the Wonder World, forcing all of the citizens within the area to be trapped there as well.
The Golem Megid then went on a rampage before being confronted by Touma Kamiyama and Mei Sudo and attempted to suck the two into a vortex. Touma was able to escape and used the 'Brave Dragon' to transform into Saber, much to the Megid's surprise. Saber then fought the Megid and, despite trying to use the blank Wonder Ride Book's power to change the area to his advantage, Saber was able to overpower the Megid and defeat it with a Rider Slash. It would then grow to giant size, though Saber would defeat it with the Kaen Juujizan.