Original Australian Daybill Movie Poster.Under Siege is a 1992 American action-thriller film directed by Andrew Davis and written by J.F. Lawton. It stars Steven Seagal as an ex-Navy SEAL who must stop a group of mercenaries, led by Tommy Lee Jones and Gary Busey, on the U.S. Navy battleship USS Missouri. Reviewers praised Tommy Lee Jones and Gary Busey's performances as the film's villains. It is Seagal's most successful film in critical and financial terms, including two Academy Award nominations for sound production. It was followed by a 1995 sequel, Under Siege 2: Dark Territory.