Game of Thrones includes a big ensemble cast. It covers various plot arcs throughout the program, set on the mythical continents of Westeros and Essos.
The first major storyline involves the Iron Crown of Westeros, as seen through a web of political struggles between noble families competing for the throne or battling for independence from whoever sits on it.
The second centers on the last descendant of the realm's overthrown royal line, who has been banished to Essos and is plotting his return to recapture the kingdom. The third follows the Night's Watch, a military order tasked with guarding Westeros against dangers beyond the realm's northern boundary.