Ridley Scott's "Prometheus" is not a direct prequel to "Alien," but it does take place in the same universe as the 1979 classic helmed by Mr. Scott. The new film follows a group of explorers, including Michael Fassbender as the android David, who set out in space to find the "engineers" that created humanity. (20th Century Fox via Associated Press)

Ridley Scott's "Prometheus" is not a direct prequel to "Alien," but it does take place in the same universe as the 1979 classic helmed by Mr. Scott. The new film follows a group of explorers, including Michael Fassbender as the android David, who set out in space to find the "engineers" that created humanity. (20th Century Fox via Associated Press)