Roy Dotrice as Hallyne
The late Roy Dotrice, who memorably performed the audiobooks for Martin’s “A Song of Ice and Fire” series with different voices for every single character, was supposed to play Grand Maester Pycelle on “Game of Thrones,” but he had to pull out of the project due to health problems. Julian Glover stepped in to play Pycelle, but Dotrice did eventually make it on the show as the pyromancer Hallyne, who provides Tyrion with the wildfire he uses to destroy Stannis’s fleet at the Battle of the Blackwater.