Lone crusader Michael Knight and his tricked-out sidekick, K.I.T.T., return in the fourth and final season of "Knight Rider." Gear up for more action and adventure with all 21 episodes from season four of "Knight Rider," available to own for the first time on DVD. Plus bonus materials include a retrospective on the greatest tv shows of the eighties. K.I.T.T. Original car blueprints, The great '80s flashback.