The series is based on George R. R. Martin's Song of Ice and Fire series of fantasy novels, which chronicle the dynastic conflicts among several families on the mythical continent of Westeros.
Dotrice, who won the Tony for his work as Phil Hogan in the 2000 revival of A Moon for the Misbegotten opposite Gabriel Byrne and Cherry Jones, will play Pyromancer Hallyne, chief of the Guild of Alchemists.
As previously reported, Dillane, who won a Tony Award for his performance as Henry in David Leveaux' revival of Tom Stoppard's The Real Thing, will play Stannis Baratheon.
Other new cast members will include Hannah Murray, who will play Gilly; Liam Cunningham, who will play Davos Seaworth; Carice van Houten who will play Melisandre; Gwendoline Christie who will play Brienne; and Natalie Dormer, who will play Margaery Tyrell.
Don't show this again.