Glen, best known for playing mercenary knight Jorah Mormont on "Game of Thrones", will portray an older version of Wayne, the alter ego of superhero character Batman, according to Deadline.
"After decades of fighting crime as Batman, billionaire Bruce Wayne is just as driven to protect Gotham from evil as he was in his prime. Needing to reconcile his relationship with Dick Grayson, the duo hope to forge a new dynamic as Bruce tries to help his former sidekick and the Titans achieve success," reads the description.
The 57-year-old Scottish actor will have a recurring role.
The season two of "Titans" will premiere on DC Universe later this year.
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