Phoenix's Joker will start the movie as Arthur Fleck. Yes, the iconic Batman villain has been given a name, something not even the comic books have done over the years. Apparently, it's thought that Fleck returns home to live with his aging mother Penny before meeting Sophie Dumond, the single mother and love interest who will be played by Beetz.
Here's where things get really shocking, though. The site reveals that Fleck's mother was "very attractive in her youth" and that she's "obsessed with her former employer." The site speculates that could be Thomas Wayne, someone described as being in his 60s and seen as "cheesy, tanned, and rich-looking" by The Joker. They then theorise that Fleck could be Wayne's bastard son, making the villain Bruce Wayne/Batman's half-brother, a unique twist on the bizarre relationship these two have.