PT 109 is a 1963 biographical war film which depicts the actions of John F. Kennedy (JFK) as an officer of the United States Navy in command of Motor Torpedo Boat PT-109 during the Pacific War of World War II. The film was adapted by Vincent Flaherty and Howard Sheehan from the book PT 109: John F. Kennedy in World War II by Robert J. Donovan, and the screenplay was written by Robert L. Breen. Cliff Robertson stars as Kennedy, with featured performances by Ty Hardin, James Gregory, Robert Culp, and Grant Williams.