Experience the ultimate in sci-fi terror with these 7 “Alien” films. From horrifying chestbusters, xenomorphs and facehuggers to unflinching heroines and unexpected synthetics, these gripping sci-fi action-thrillers never let go. In “Alien,” the film that started it all, the crew of the space-tug Nostromo responds to a distress signal, only to discover a deadly life form that breeds within human hosts. In “Aliens,” after drifting through space in hypersleep for 57 years, Ellen Ripley accompanies a team of Colonial Marines back to LV-426...and this time it’s war. When Ripley crash-lands on Fiorina 161 in “Alien3,” the body count begins to mount as an Alien was aboard her craft. In “Alien Resurrection,” a group of scientists have cloned Ripley — along with the Alien queen inside her — hoping to breed the ultimate weapon. Searching for the origin of human life in “Prometheus,” a team of scientists and explorers encounter a terrifying threat instead, capable of destroying humankind. Then bound for a remote planet on the far side of the galaxy in “Alien: Covenant,” the crew of a colony ship uncovers a deadly threat beyond their imagination. And in “Alien: Romulus,” while scavenging the deep ends of a derelict space station, a group of young colonizers come face-to-face with the deadliest life form in the universe. Watch these 7 iconic films from “Alien” to “Alien: Romulus,” or follow the Alien universe timeline from “Prometheus” to “Alien: Resurrection.” You’ll be shocked, surprised and terrified down every dark and drippy spaceship corridor.