HBO just released a teaser for season 8 of "Game of Thrones." The clip shows a chilly wind sweeping across the Westeros map, engulfing a wolf (likely signifying the Starks) and a dragon. From the other end of the map sweeps a fire that torches a lion (representing the Lannisters) before meeting the ice in a huge clash. Watch the full clip above.The fantasy series returns in April 2019, almost two years after the seventh season finished in August 2017, and will conclude the saga of the Iron Throne.