Ari Aster just landed one of the biggest movie stars on the planet to lead his fifth feature. Scarlett Johansson will star in “Scapegoat,” which is set up at A24 and which Aster will write, direct, and produce, an individual with knowledge of the project told IndieWire. If you thought there would be any plot details today about a new Aster joint, think again. Everything is under wraps for now, but Deadline , which first reported the news, reports that Johansson was Aster’s first choice for his latest idea. Aster is producing with his partner Lars Knudsen for their Square Peg banner. Johansson has a busy shooting schedule that includes the next “Batman” movie opposite Robert Pattinson and an “Exorcist” reboot for Universal.…