One of the most ironic aspects in Joker: Folie a Deux is the fact that there is constant mention of an in-movie Joker film based on Arthur Fleck’s life. But although we never see this fake movie, director and co-writer Todd Phillips says they almost did film some of it, and it was supposed to star Beetlejuice 2 actor Justin Theroux.
"Well, Justin Theroux of course," said Phillips in an interview with IGN when asked who plays Joker in the TV film. Fans of the franchise will know that Theroux made a cameo in the first Joker film as actor Ethan Chase who is a guest star on Murray Franklin’s talk show, the same talk show host who Fleck murders at the end of the movie.
