Gollum

Gollum, real name: Smeagol, is the tertiary antagonist of J.R.R. Tolkien's Middle-Earth legendarium. He is a supporting antagonist in The Lord of the Rings: The Fellowship of the Ring, a major character of The Lord of the Rings: The Two Towers, the central antagonist of The Lord of the Rings: The Return of the King, and a major antagonist of The Hobbit: An Unexpected Journey.