1982's The Challenge has yet to appear on DVD in any part of the world. I would assume that this CBS Theatrical would now belong to Paramount -and that may be my answer right there (although they have released CBS' Back Roads and Grandview USA). Could this also lie with Lionsgate or MGM via it being amn Embassy release to theaters? In any case this is one of the best later films of John Frankenheimer. Great action and very entertaining.