Terrence "Terry" O'Quinn is an American actor who is best known for his roles as the title role in the 1987 thriller film, The Stepfather and its 1989 sequel, Peter Watts on the Fox television series Millennium from 1996 to 1999, and as John Locke on the ABC television series Lost from 2004 to 2010.

He is also known for his role as Commander Joe White on the CBS police procedural drama series Hawaii Five-0 from 2011 to 2012.

For Disney, he played famous aviator and filmmaker Howard Hughes in the 1991 period superhero adventure film, The Rocketeer, Frank Ridell in Shadow Conspiracy, and Mayor John Clum in the 1993 Hollywood Pictures film, Tombstone and voiced Professor Mystery in the Phineas and Ferb episode "Lost in Danville". He also played John Warner in the second season of the ABC TV show, Secrets and Lies.

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