From :

Earlier this week we learned that Glow star Marc Maron was in talks to join Joaquin Phoenix in Joker, and now the actor has confirmed it himself on the latest episode of his podcast. Maron also confirmed that Robert De Niro has joined the cast, and that was one of the reasons that made him want to be a part of it. Maron has been critical of big budget superhero movies in the past, and addressed that on his podcast as well.

Read the Full Story