HBO has released the final trailer for the third season of "House of the Dragon", a continuation of the "Game of Thrones" world. The season premieres June 21, 2026 on HBO Max (US), and the new footage makes clear that the feud between the "green" and "black" Targaryens is spiraling into open war — blunt, loud, and often brutal. Showrunner Ryan Condal and the promos flag a major naval confrontation, the Battle of the Narrow Sea (esp. important since it kicks the season off), which immediately pushes the story into a war footing. The trailer foregrounds Rhaenyra Targaryen, Daemon Targaryen, and Aegon II; their moves accelerate both the political mess and the fighting across Westeros. The creators warn this season leans heavily toward military spectacle — dragons and fleets dominate and key strongholds fall — so don’t expect gentle pacing; expect chaos, smoke, and consequences.