You've just finished watching a film and you enjoyed/hated it, but there is a nagging sense of frustrating because the film forgot or intentionally left unanswered a plot line or a character said something interesting but was never resolved or expanded upon. Note that these are note plot holes. For me it's Aliens, ever since I saw it at the age of 8, I always wondered what were the other alien race mentioned in the film, the Arcturians. If you don' know what I'm talking about (most do, even hardcore Alien fans), They are mentioned just before the knife scene with Bishop and Hudson where Frost and Spunkmeyer can be clearly heared talking to each other: I've always wondered what these Arcturians are? The best I've ever found are that they are some sort of humanoid from the Arcturus star system. They've never appeared or mentioned in any other Alien films, comic, games, novel, slash fiction. How or why has anyone never brought them up again considering this is a franchise that builds plots on tiny references and one off line. There another alien race for Engineer's Sake! What unanswered plot lines and unexplained concepts annoy you? Which do you want answers for?