Alien: Covenant (MA15+) Ridley Scott decided to start the Alien franchise again five years ago with Prometheus, a prequel to the original Alien, set some 20 years before Sigourney Weaver’s Ripley confronted the creature. In Alien: Covenant Scott hasn’t stinted on the blood and gore. He wants to make two more films that bridge the storyline gap between this and the first film, so he has to have a commercial success. Alien: Covenant is for the most part a terrifically exciting ride. But it never chills the marrow quite in the way the first film did.