Movie Credits
Cillian O'Sullivan has appeared in 5 movies.
These include Uncle Bill's Barrel, Misty Button, The Lost Princess, Maze and Halo: Nightfall.TV Credits
Cillian O'Sullivan has appeared in 10 shows.
These include In From the Cold, The Boy That Never Was, Then You Run, Seacht, Daredevil: Born Again, Star Trek: Strange New Worlds, Vikings, Bull, The Blacklist and Chicago P.D..