Email Submission/Tatum Wan Movie Katie Cassidy and William H. Macy lead the cast of 'SPEED DEMON,' a horror film about a nun performing an exorcism on a demon-possessed train, set for releas... April 22, 2026 AceShowbiz - Katie Cassidy and William H. Macy are set to star in the upcoming horror film SPEED DEMON, which is scheduled for release on May 31, 2026, in theaters and on demand/digital. The movie, directed by Jon Keeyes and written by Domenico Salvaggio, follows a nun who must perform an exorcism on a demon-possessed train.