With about two months to go before its theatrical release, “Alien: Romulus” has dropped a new trailer, offering a closer look at its plot, characters, and scares.“Alien: Romulus” takes the phenomenally successful “Alien” franchise back to its roots: While scavenging the deep ends of a derelict space station, a group of young space colonizers come face to face with the most terrifying life form in the universe.