Setting the scene
Fantasy on television had been niche and often cancelled, while HBO sought another flagship after The Sopranos ended. David Benioff and D.B. Weiss adapted George R.R. Martin's unfinished A Song of Ice and Fire novels, promising political intrigue, sex, and violence unsuitable for broadcast networks. Martin's books had cult status, but no one knew if casual viewers would track dozens of noble houses.
What happened
Game of Thrones premiered on HBO on April 17, 2011, with Sean Bean as Ned Stark, Peter Dinklage as Tyrion Lannister, and Emilia Clarke as Daenerys Targaryen. The pilot introduced Winterfell, the Wall, and the threat beyond it while setting up betrayal in King's Landing. Ramin Djawadi's theme and title sequence mapped a fictional world that fans studied like homework.
Why it still matters
The show ran eight seasons, became appointment viewing worldwide, and won fifty-nine Emmys, though its final season sparked massive fan backlash. It proved expensive fantasy could anchor subscriptions and piracy debates. Memorable detail: the unaired original pilot was largely reshot after executives decided audiences could not tell the Stark and Lannister families apart.
Background
The adaptation became appointment television worldwide.