Giygas

Giygas (Giegue (JP) in EarthBound Beginnings), also romanized as Gyiyg, is the main antagonist in EarthBound Beginnings and EarthBound. In both games, he's an alien being of vast power, ready to conquer Earth by impacting people and animals as well as sending Starmen, UFOs and other robot/alien-like enemies to the protagonist.

It is known Shigesato Itoi, the producer of both games, was inspired by a film to make Giygas's speech in EarthBound. He'd mistakenly entered an adult movie theater and caught a glimpse of a rape scene from Kenpei to Barabara Shibijin (JP) and had a traumatic experience (though, in reality, there is no such scene in the film, but rather a murder scene). He wanted Giygas to make people feel just the way he felt at that moment. Truly Giygas, in EarthBound, is one of the most disturbing enemies in the history of gaming.