Prepare to get the shaft from TNT — a 10-hour Shaft marathon on Tuesday, that is! The cable network will air the three original Shaft movies, as well as two 90-minute episodes of CBS's short-lived Shaft TV series. The marathon also features a discussion with Samuel L. Jackson, John Singleton (star and director, respectively, of the new Shaft movie hitting theaters this Friday) and Richard Roundtree, the original Shaft.