The actor revealed at Comic-Con that he has already spent 10 months in the studio recording lines for the game, although he did not specify which role he would be playing. Conroy was the voice of Batman in Arkham Asylum and its sequel, Arkham City. He also played the character in the massively multiplayer online game DC Universe Online, and the recently released DC brawler Injustice: Gods Among Us
The news contradicts reports earlier this year that the actor would not be reprising his role as the Caped Crusader in Arkham Origins.
Fans will have a chance to gain access to unannounced Deathstroke DLC when preordering Arkham Origins, according to an offer on Amazon.
No further details about the character's involvement are available, although Deathstroke was previously featured in a Warner Bros. teaser trailer fighting Batman.
Batman: Arkham Origins tells the story of Batman's early years in the Arkham series. It is the first game in the universe not to be developed by UK developer Rocksteady. The game is scheduled for release on the Xbox 360, PlayStation 3, PC, and Wii U on October 25.