"A Dragon in the Snow" is a sweeping, original spin-off of the Game of Thrones universe, set during and after the events of the final season. The series centers on Jonathan Majors as Jaehaegon Targaryen, a long-lost Targaryen "prince" whose return upends the fragile balance of power in Westeros. With the realm fractured and winter still biting, Jaehaegon must navigate deadly politics, ancient magic, and his own haunted past to claim his birthright—or forge a new destiny.