Theon Greyjoy is a major character in the first, second, third, fourth and fifth seasons. He is played by starring cast member Alfie Allen and debuts in the series premiere. Theon is the heir of Lord Balon Greyjoy of the Iron Islands. He has been a hostage of House Stark since his father's failed uprising against King Robert Baratheon. Despite his status, Theon became a close friend to Robb Stark. However, after Robb sent him as an emissary to his father during his war against the Iron Throne, the Greyjoy prince turned on the Starks and joined Lord Balon in his campaign to seize the North. He took over Winterfell and installed himself as Prince of Winterfell until he was betrayed by his own crew and delivered to House Bolton shortly after. As a prisoner of Ramsay Snow, the "Bastard of Bolton", he has been subjected to physical and psychological torture and mockingly renamed as "Reek".