I had some strange problems with the first Quadrilogy set I bought too. Several of the discs were mis-labeled, & on top of that the Aliens disc was actually a second copy of Alien, meaning that one of the films was completely missing from the set. By the time I figured that out, I had already thrown away my receipt. I re-purchased the set a few months later though, & checked to make sure that all the right films & discs were in it.