Oliver Stone's docudrama chronicles New Orleans district attorney Jim Garrison's investigation into the assassination of President John F. Kennedy - controversially putting to the test some of the incredible details of the official "single assassin" and "magic bullet" explanations that have quietly plagued the nation for decades. Kevin Costner heads a tremendous all-star cast, with the real Garrison in an ironic cameo as future Supreme Court Justice Earl Warren, of the government's infamous Warren Commission.