Joaquin Phoenix in and as Joker. Warner Bros. Pictures/ Facebook

Filming of the standalone film “Joker” continues, and details about new cast members have surfaced online. Young Bruce Wayne, who will eventually become the Caped Crusader, and his butler have reportedly been cast.

Dante Pereira-Olson has been cast as Young Bruce Wayne, according to TheHollywoodReporter. The actor has previously worked with Joaquin Phoenix, who plays the titular role of the villain in the upcoming film. Some of Pereira-Olson’s other projects include TV shows “Jessica Jones” and “Happy!,” and the 2017 film “You Were Never Really Here.”

The report notes that the casting of Pereira-Olsen will help explain the age difference between Batman and the Joker in the film. It remains to be seen just how big a role this is, and how much screen time Young Bruce will get.

Actor Douglas Hodge has reportedly been cast as the butler Alfred Pennyworth. The faithful butler is one of the few people who know the secret identity of Batman, and he is a loyal supporter of the billionaire’s fight against the villains in Gotham.

The projects that Hodge has been a part of include TV shows like “The Good Wife,” “The Night Manager,” “Penny Dreadful,” “Black Mirror,” and “Elementary”; and the recent movies “Wanderland” and “Red Sparrow.”

Some of the other cast members of the film include Robert De Niro, Zazie Beetz (Sophie Dumond), Bryan Callen, Shea Whigham, Marc Maron, Bill Camp, Glenn Fleshler, Brett Cullen (Thomas Wayne), and Josh Pais (Hoyt Vaughn). Alec Baldwin was supposed to play Thomas Wayne, but he dropped out for some reason.

The film is being directed by Todd Phillips. The script has been written by Scott Silver and Phillips.

“Joker” is set to be released on Oct. 4, 2019 in the US. The producers are yet to announce an exact release date for the Australian market.