HBO has dropped a new trailer for its "Game of Thrones" prequel, "House of the Dragon."

"The dream... it was clearer than a memory," he says. "And I heard the sound of thundering hooves, splintering shields and ringing swords

"House of the Dragon" is based on George R.R. Martin's 2018 novel "Fire & Blood" and will cover the events that transpired 200 years before "Game of Thrones."

"House of the Dragon" premieres August 21 on HBO Max, which like CNN is a unit of Warner Bros. Discovery

Having dropped an initial teaser trailer in October and a second earlier this year, the full-length trailer went live just a few hours ago

The fresh trailer sets us up for the ten-episode first season, which tells the story of Rhaenyra and Aegon Targaryen and the war of the Seven Kingdoms

The series is set to premiere on HBO Max on August 21 in the US and simulcast on Sky Atlantic/NOW in the UK in the early hours of August 22

Last month it was announced that Kit Harrington would reprise his role as Jon Snow in a Game Of Thrones sequel series