Game of Thrones is an American fantasy drama television series created for HBO by showrunners David Benioff and D. B. Weiss. It is an adaptation of A Song of Ice and Fire, George R. R. Martin's series of fantasy novels, the first of which is titled A Game of Thrones. The series, set on the fictional continents of Westeros and Essos interweaves several plot lines with a broad ensemble cast. The first narrative arc follows a civil war among several noble houses for the Iron Throne of the Seven Kingdoms; the second covers the attempts of the exiled last scion of the realm's deposed ruling dynasty to reclaim the throne; the third chronicles the rising threat of the impending winter and the legendary creatures and fierce peoples of the North.