Ella Purnell, currently starring in Prime Video's Fallout, has joined director Ari Aster's upcoming film Scapegoat for A24, alongside previously announced cast members Scarlett Johansson, Jacob Elordi and Jude Law. Purnell joins fellow new cast additions Caleb Landry Jones and Samba Schutte, assembling a considerable ensemble cast for the project that Aster will write and direct.

Remarkably, Aster has disclosed virtually nothing about the film's plot, with no official premise or character details released despite the growing roster of stars. Speculation about the project's storyline has ranged from a sci-fi romance to a drama involving a doctor operating on an internet-famous person, though Aster's varied directorial track record—spanning horror, comedy and political satire—makes pinning down the project from cast alone futile. The film has no official release date as yet.