God (Supernatural)

God, known mostly by his alias Chuck Shurley, is the overarching antagonist of the Supernatural television series as a whole. He appears as a recurring character in seasons four to five, a cameo character in season ten, and a supporting protagonist in season 11. He reappeared as the final antagonist of the fourteenth season, and will be the primary antagonist of the fifteenth and final season of the show.

Overview
God is the creator of the universe and everything in it, including archangels, angels, earth and other planets, the human race and many other creatures. Many years prior to the series' events, he left heaven out of shame of his creations and began living on earth under the identity of Chuck Shurley. Whilst never directly intervening in the many of the show's events, he did indirectly aid the Winchester brothers Dean and Sam during season 4-5 whilst they tried to avert the apocalypse. In season 11, Chuck revealed himself as God, and finally began aiding the brothers in trying to stop God's sister the Darkness from destroying the planet and the rest of reality.

God returned in season 15, and revealed his more sinister side, and that he was the creator of many parallel universes that acted as failed drafts to his stories. He was particularly interested in the universe the Supernatural continuity takes place in, and kept the Winchester brothers endless battles and conflicts going for the sake of the story, and was unwilling to let go. When the brothers refuse to kill Jack, God kills Jack and unleashes the apocalypse on the world for the brothers' defiance against him, deciding to finally bring the "story" to an end as they wished.