Upcoming 'Game of Thrones' Spinoff Makes Big Casting Announcement

HBO's upcoming Game of Thrones prequel spinoff A Knight of the Seven Kingdoms is really starting to flesh out its cast. On Thursday, the series added seven names to its growing roster, joining leads Peter Claffey, who will play Ser Duncan the Tall, and Dexter Sol Ansell as his squire Egg.

As usual, the newly announced cast members include lesser-known names; Edward Ashley ( Masters of the Air ) as Ser Steffon Fossoway, Henry Ashton ( My Lady Jane ) as Daeron Targaryen, Youssef Kerkour ( Napoleon ) as Steely Pate, Australian actor Daniel Monks as Ser Manfred Dondarrion, Shaun Thomas ( The Brothers Grimsby ) as Raymun Fossoway, Tom Vaughan-Lawlor ( Avengers: Infinity War ; Avengers: Endgame ) as Plummer, and English TV and film actor Danny Webb as Ser Arlan of Pennytree.

The cast also includes Finn Bennett ( True Detective: Night Country ) as Aerion Targaryen, Bertie Carvel ( The Crown ) as Baelor Targaryen, Tanzyn Crawford ( Tiny Beautiful Things ) as Tanselle, Daniel Ings ( Sex Education ) as Ser Lyonel Baratheon, and Sam Spruell ( Fargo ) as Maekar Targaryen.

The series picks up about 100 years after the prequel House of the Dragon and 100 years before the series events depicted in Game of Thrones , which ran for eight seasons from 2011 to 2019. The series is based on the Tales of Dunk and Egg novellas penned by Thrones author George R. R. Martin, The Hedge Knight (1998), The Sworn Sword (2003) and The Mystery Knight . (2010).

According to Variety , the official description of the series reads as follows:

"A century before the events of Game of Thrones , two unlikely heroes wandered Westeros … a young, naïve but courageous knight, Ser Duncan the Tall, and his diminutive squire, Egg. Set in an age when the Targaryen line still holds the Iron Throne, and the memory of the last dragon has not yet passed from living memory, great destinies, powerful foes, and dangerous exploits all await these improbable and incomparable friends."

HBO gave viewers a first-look of the series in a teaser of what's coming to the Max streaming platform that coincided with the season two finale of House of the Dragon on Sunday night. The six-episode first season is set to air in 2025, likely before the third season of the aforementioned prequel series.