The two-time Tony nominee is one of six new stars joining the period drama.

Even more theatre stars will be part of the upcoming third season of Julian Fellowes' HBO period drama.

The season two finale aired December 17, and all episodes are now available to stream on Max.

HBO has also released first-look photos and the second season drop date for the Broadway-stacked period drama.

The Tony-nominated and Olivier-winning dark comedy starred Alfie Allen and David Threlfall.

The Martin McDonagh play returned to the Golden Theatre April 21.

Game of Thrones' Alfie Allen and Shameless' David Threlfall lead the cast of the Olivier-winning comedy.

Game of Thrones' Alfie Allen and Shameless' David Threlfall lead the cast of the Olivier-winning comedy.

The actor, currently making his Broadway debut, previously played Theon Greyjoy on Game of Thrones.

Game of Thrones' Alfie Allen and Shameless' David Threlfall will lead the cast at the Golden Theatre.

The festival, curated by Mike Lew and Colette Robert, will feature Broadway alums for a marathon entirely comprised of BIPOC artists.