Demi Moore to star in Tyrant Demi Moore will reportedly play a key role in Tyrant alongside Charlize Theron and Julia Garner. 15 April 2026 Demi Moore has joined the cast of Tyrant. Demi Moore will star in Tyrant The Substance actress will reportedly play a key role in the upcoming Amazon MGM Studios thriller, which was previously announced to star Charlize Theron and Julia Garner.