Originally credited as the 'Unseen Arkham Prisoner,' his character is established as a 'proto-Joker' with a congenital condition who already shares a combative history with the Caped Crusader.
| Actor Age | 33 years old (as of 2026) |
| Official 2022 Credit | Unseen Arkham Prisoner |
| Theatrical Screen Time | 80 seconds |
| Deleted Scene Length | 5 minutes |
| Prosthetic Makeup Time | 6 hours per session |
Irish actor Barry Keoghan stepped into one of cinema's most iconic villain roles with his appearance as the Joker in Matt Reeves' The Batman universe. Making his debut in the theatrical release on March 4, 2022, Keoghan's involvement was initially shrouded in mystery. He appears for a mere 80 seconds of theatrical screen time at the end of the film, where he is credited simply as the "Unseen Arkham Prisoner." In this brief but impactful cameo, he shares a moment with Paul Dano's Riddler, hinting at a much larger presence within the grim walls of Arkham Asylum.
While audiences only caught a glimpse of his character in the cinematic cut, a significant five-minute deleted scene released on March 24, 2022, provided a much deeper look into Keoghan's iteration of the villain. Warner Bros. officially unveiled this sequence after dedicated fans successfully solved a series of complex puzzles on the "Rataalada" viral marketing website. The extended interaction between Keoghan’s Joker and Robert Pattinson’s Batman confirmed that the two characters already share a tense, established history. Within the continuity of Reeves' universe, Batman had previously captured this "proto-Joker" during his first year of crime-fighting, placing him firmly in Arkham before the main events of the 2022 film even unfold.
A New Origin and Grueling Transformation
One of the most defining aspects of Barry Keoghan's Joker in The Batman is the distinct departure from the character's traditional comic book origins. Director Matt Reeves specifically stated that this version of the villain did not fall into a vat of chemicals at Ace Chemicals. Instead, Keoghan's character suffers from a severe congenital disease that physically prevents him from stopping his smiling. This biological approach to the Joker's signature grin roots the character in the grounded, gritty reality that defines Reeves' cinematic world.
Bringing this harrowing vision to life required an intensive physical transformation for the 33-year-old actor (as of 2026). The intricate prosthetic makeup for Keoghan's Joker was meticulously designed by acclaimed makeup artist Mike Marino. Achieving the scarred, unsettling look demanded tremendous patience, as the application process took approximately six hours for every single filming session. This grueling commitment resulted in a deeply unsettling visual representation that matches the psychological darkness of a villain who has already faced off against Gotham's vigilante.
From a $10 Audition to Arkham
Interestingly, Keoghan's journey to becoming the Clown Prince of Crime began with a completely different villain in mind. He originally auditioned for the role of The Riddler by taking the initiative to send an unsolicited self-tape to the production team. In this homemade audition, which cost him about $10 to produce, the 172 cm tall actor filmed himself walking in slow motion while wearing a top hat and wielding a cane. Although he did not land the part of The Riddler, the tape clearly made an impression, ultimately securing him a place in Gotham's rogues' gallery. With The Batman Part II currently scheduled for release on October 2, 2026, it remains unknown exactly how much screen time Keoghan will command, or if the "Unseen Arkham Prisoner" will finally adopt his infamous moniker.
