Giger's ''Alien III'' -- many, many brilliant unused drawings, the most obvious being the feminine, erotic alien with a peristaltic head, piping musical ''voice'' and the lethal kiss that tears out the viscera of its pseudo-monastic ''lovers''.
In fact, I would cheerfully subscribe to an independent film (crowd-funding I think) that recreated his designs, although it would, I think, descend into a copyright mire, ''stumble and fall, and rise no more''.
If I have insufficient posts to post here, please forgive me: I have looked for rules and cannot seem to find them, likely because of the lateness of the hour.