It’s what the inmate does next, though, that starts a discussion about Joker 2 being a prequel to The Dark Knight. After taking out Arthur and telling him a joke about clowns, he turns the blade ...

SEE ALSO: 'Joker: Folie à Deux' review: A middle-finger to fans of Lady Gaga, the DC movies, and musicals in general But just what exactly is that hint at The Dark Knight, and why is it so misguided?

This scene has led to a fan theory speculating that this unnamed inmate is the younger version of the Joker from The Dark Knight. In that movie, Heath Ledger’s character has similar scars.

Heath Ledger stunned the world with his portrayal of the Joker in The Dark Knight. The DC supervillain is presented much more realistically than he ever had before, but he retains as much menace ...

The Amazing Spider-Man star Andrew Garfield has reflected on working with Heath Ledger on The Imaginarium of Doctor Parnassus ...

He says all it takes is “one bad day” to send anyone spiraling into the abyss. In The Dark Knight, the Joker’s perspective is so warped that love is as foreign to him as a unicorn in Gotham.

It seems like a pretty blatant nod to the late Heath Ledger's take on the Joker from The Dark Knight, but is it actually supposed to be the same character? We highly doubt it - for multiple reasons.

Many DC fans have theorized that Arthur’s killer could be an homage to Heath Ledger’s Joker in “The Dark Knight,” since both of them sport the same gnarly scars around their mouths.