Lost was on FOX.
Dr. Jack Shephard is a fictional character and the protagonist of the ABC television series Lost , played by Matthew Fox . Lost is an American television drama series that originally aired on the American Broadcasting Company ( ABC ) from September 22 , 2004 , to May 23 , 2010 , over six seasons , comprising a total of 121 episodes . The first season garnered an estimated average of 16 million viewers per episode on ABC .