Also known as Giegue, the "Embodiment of Evil" and the "Universal Cosmic Destroyer", Giygas was an evil alien who intends to sentence all of reality to the horror of infinite darkness. Giygas was an alien raised from infancy by a woman named Maria and her husband George, both of whom were abducted from Earth in 1909. During this time, George studied the alien's PSI powers without their permission, culminating with their escape back to Earth. Once he matured, Giygas was tasked by his people to ensure that PSI never spread onto Earth.
However, Giygas did not want to betray those who raised him, particularly Maria. In the end, he was forced to detach himself from Maria and begin preparations for the invasion of Earth. Sometime before the invasion, Giygas comes across the Apple of Enlightenment, a fruit that shows the future. Giygas learns of his inevitable defeat at the hands of Ness, and so he attacks Earth twenty years before this would occur in order to disprove the prophecy.