John Locke, most often referred to by his surname "Locke", is a fictional character on the ABC television series Lost played by Terry O'Quinn. Although he typically has a calm demeanor on the island, his flashbacks portray him as angrier and more emotional. He is the antithesis to Jack Shephard and to a certain extent Ben Linus. In 2007, O'Quinn won the Emmy award for acting in a supporting role.