In the latest casting announcement for the upcoming 'Joker' sequel, Jacob Lofland will be playing an unnamed Arkham Asylum inmate.

The mysterious role has caused many to theorize who the new inmate could be in regards his relationship with Joaquin Phoenix's Arthur Fleck. The Hollywood Reporter, who first broke the news, outlined that Lofland's character "develops a relationship" with Fleck in the upcoming film.

There are plenty of possible characters Loflund might play. There's also the very real possibility that he's an entirely new character with no connection to the comics. Nevertheless, we'll have fun checking out the online theories for the months to come.

Lofland made his debut opposite Matthew McConaughey in the 2013 film 'Mud' by director Jeff Nichols. He also played Aris in the 'Maze Runner' franchise.

The 26-year-old joins Brendan Gleeson in the latest casting announcements for the 2019 film's sequel. Gleeson was added last week in an undisclosed role.

Lady Gaga confirmed a number of weeks ago that she had joined the cast as Harley Quinn. Catherine Keener will also star, as well as Zazie Beetz reprising her role from the first film.

'Joker: Folie á Deux' was also confirmed as a musical. Considering this news and the casting, it will be a far cry (or laugh) from what we saw in the first film. However, we're sure it will be just as dark and twisted as Todd Phillips' original.

Mysterious Arkham inmates are certainly in vogue this year as Irish star Barry Keoghan turned up in a very brief cameo and a longer deleted scene as "unnamed Arkham inmate" in Matt Reeves' 'The Batman' earlier this year.

For now, we can only guess as to who Loflund will be playing in 'Folie á Deux'.

'Joker: Folie à Deux' has a release date of October 4, 2024.