Game of Thrones is built on a foundation of shocking twists that continuously upend the narrative. The first major twist is the execution of Ned Stark in Season 1, which establishes that no one is safe. The Red Wedding in Season 3 is perhaps the most infamous, where Robb and Catelyn Stark are betrayed and murdered, seemingly ending the Stark cause. Joffrey Baratheon's poisoning at his own wedding in Season 4 removes a key villain, creating a new power vacuum and leading to Tyrion's persecution.
A central, long-running mystery is the truth of Jon Snow's parentage. The fan theory "R+L=J" is confirmed in Season 6: Jon is not Ned Stark's bastard but the son of Rhaegar Targaryen and Lyanna Stark, making him the legitimate heir to the Iron Throne. This revelation redefines his identity and puts him in direct conflict with his lover and ally, Daenerys Targaryen.
The series finale sees Daenerys, having successfully conquered Westeros, descend into tyranny by incinerating King's Landing and its civilian population. Fearing she will be another tyrant, Jon Snow assassinates her in the throne room. In the aftermath, the dragon Drogon melts the Iron Throne, symbolically ending the destructive game for power. The lords and ladies of Westeros elect Bran Stark, now the all-knowing Three-Eyed Raven, as the new King of the Six Kingdoms (the North having seceded peacefully under Sansa Stark). Jon is exiled to the Night's Watch once more as punishment, Arya sails west to explore unknown lands, and Tyrion is named Hand of the King, tasked with rebuilding the realm. The ending suggests a breaking of the old system of hereditary monarchy in favor of a new, elective one, but leaves the futures of its main characters and the realm ambiguous.