Game of Thrones is an adaptation of A Song of Ice and Fire, a series of fantasy novels by George R. R. Martin. The show premiered on HBO in the U.S. on April 17, 2011, and concluded on May 19, 2019, with 73 episodes broadcast over eight seasons. A prequel series, House of the Dragon, premiered in 2022; a second prequel is scheduled to debut in 2025. The series has an ensemble cast estimated to be the largest on television.
Game of Thrones is roughly based on the storylines of the A Song of Ice and Fire book series by George R. R. Martin. The series is set in the fictional Seven Kingdoms of Westeros and the continent of Essos. In 2014, several actors' contracts were renegotiated to include a seventh-season option.