Last week, Steam removed Aliens: Colonial Marines and Alien vs. Predator 2010. Speculation arose as to why it happened -- was it because of all the Colonial Marines drama at Gearbox in the past, or is it because of a licensing issue?
All of the worrying was for nothing it seems, because both games have re-appeared on Steam. In other Alien-related news, go ahead and check out Isolation during the next Steam sale -- you won't regret it.