The final boss of the video games Mother and Mother 2. Known as Gyiyg in the original.
In the first game, his appearance was of a grayish alien. In the second game, his appearance changed drastically, becoming one swirling red face which appears to be screaming.
He is best known for the mind rape his appearance and attacks in Mother 2 causes, spawning the line "You cannot grasp the true form of Giygas' attack".
