It looks like Joaquin Phoenix (The Joker: The Clown Prince of Crime) is getting a Hollywood legend to join the cast for the upcoming The Joker Origins movie!

If you guessed the Taxi Driver himself, Robert De Niro, then you money. Read on to get more casting details…

CelebNMovies247.com has learned that Robert De Niro may be joining Warner Bros. working title Joker origins movie operating under the working title ‘Romeo.’

In fact, the film may be getting the Martin Scorsese treatment who will be executive producer on the project, but it also means Robert De Niro will be taking on a supporting role.

It’s being reported that Warner Bros. is keen to add an actor of De Niro’s caliber to the project. He is said to be up for the part of Murray Franklin (a codename, perhaps?), details on his mystery character are practically non-existent.

Here are the breakdown for the characters in the film beginning with Penny.

Penny: Supporting female (60-74), Caucasian.

Lower class, very attractive in her younger days, still feels that way about herself. But recently her health has started failing, and she’s nearly bedridden in her Lower East Side apartment which she shares with her grown son who just moved back home. She’s obsessed with her former employer and can’t believe that this is what her life has come to, that she has ended up here, like this.

Sophie Dumond: Supporting female (27-34):

An African American or to play Latina. Not beautiful, has a hardness to her, a single mother living on the Lower East Side, doing the best she can, trying to make ends meet; worn out by the grind of the city. She understands how the system is stacked against her and the people in her community, how unjust it all is for them. She’s just trying to catch a break.

Randall: Supporting male (40-59):

Caucasian. Thinks he’s the wisest and most knowledgeable person in any room he’s in, tries to present himself as a mentor to everybody, but is really just looking out for himself, burly.

Gary: Supporting male (30-49), any ethnicity:

A dwarf. Randall’s best friend, he’s good-natured and a buddy to his colleagues at work, one of the only decent people in the whole movie.

Hoyt Vaughn: Supporting male (50-69) any ethnicity:

The old-school manager of hotel staff. He’s seen it all, and finds it difficult to give a shit about much of anything anymore.

Detective Garrity: Supporting male (50-59), any ethnicity:

Police Detective in a city on the brink; a by-the-book cop, worn down by all his years on the force. He doesn’t care about or take into consideration any of the societal or political ramifications of his cases.

Detective Burke: Supporting male (30-39), any ethnicity:

A Police Detective and Garrity’s partner; he’s an asshole, who gets off by being in a position of authority. Being a cop is how he defines himself.

Writer/Director Todd Phillips will be bringing this film to life which is said to have a September start date. Basically, its a busy summer for Gotham’s most famous criminal.