House of the Dragon Season 3 Trailer Released: "The Throne Knows No Mercy"

The highly anticipated third season of House of the Dragon is almost here. HBO has dropped the official trailer for the upcoming season, which premieres Sunday, June 21 at 9 p.m. ET/PT on HBO and streams on HBO Max.

The new season will span eight episodes, rolling out weekly through the finale on August 9. The tagline accompanying the trailer—"The throne knows no mercy"—hints at the ruthless conflicts to come.

Set 200 years before the events of Game of Thrones and based on George R.R. Martin's "Fire & Blood" novel series, House of the Dragon chronicles the saga of House Targaryen and the power struggles that define their reign.

The ensemble cast for Season 3 features Matt Smith, Emma D'Arcy, Olivia Cooke, Steve Toussaint, Rhys Ifans, Fabien Frankel, Ewan Mitchell, Tom Glynn-Carney, Sonoya Mizuno, Harry Collett, Bethany Antonia, Phoebe Campbell, Phia Saban, Jefferson Hall, Matthew Needham, James Norton, Tom Bennett, Kieran Bew, Kurt Egyiawan, Freddie Fox, Clinton Liberty, Gayle Rankin, Abubakar Salim, Tom Cullen, Tommy Flanagan, Dan Fogler, Joplin Sibtain, and Barry Sloane.