3 Not the 9 disc setBargainHunter1987 | 13/06/2013 | See all BargainHunter1987's reviews (1)There are 2 Prometheus To Alien sets. This is the 8 disc set that doesn't contain Prometheus in 3D. I'm disappointed because I only knew about the 9 disc set that does contain Prometheus in 3d. This was reduced to a good price and overall it is a great box-set. At the price that it is currently on sale for you could get the 9 disc set. I don't think this advert was detailed enough and had I paid full price I would have returned the set.