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The Game of Thrones prequel is expanding its cast!

The upcoming prequel pilot being developed by HBO has added five new stars to its ensemble cast as of Wednesday (March 27), Deadline reports.

Marquis Rodriguez of When They See Us, John Simm of Strangers, Philip K. Dick’s Electric Dreams star Richard McCabe, Dracula‘s John Heffernan and Dixie Egerickx of The Secret Garden will appear as series regulars in the upcoming pilot, penned by writer Jane Goldman and Game of Thrones co-executive producer George R.R. Martin.

The untitled prequel “takes place thousands of years before the events of Game of Thrones and chronicles the world’s descent from the Golden Age of Heroes into its darkest hour. And only one thing is for sure: From the horrifying secrets of Westeros’ history to the true origin of the white walkers, the mysteries of the East to the Starks of legend — it’s not the story we think we know.”

The new cast members join an array of previously announced stars including Naomi Watts, Josh Whitehouse and Naomi Ackie.

Andrew Garfield is dapper in a suit while posing inside at the inaugural Casting Awards held at The Ham Yard Hotel on Tuesday (February 12) in London, England.

The 35-year-old actor was joined at the event by Lucy Boynton, Claire Foy, Gemma Arterton, Jade Anouka, Natalie Dormer, Richard E. Grant, Russell Tovey, Eleanor Matsuura and John Simm.

The event was held in celebration of the significant achievements of casting in the fields of Theatre, TV, Film and Commercials in the UK.

Winners in the categories included Paul Wooller, Felicity French and Trevor Jackson for the West End production of Hamilton, Debbie McWilliams for best casting in a film, Kate Rhodes James Casting for best casting in a TV production, and Michael Cox and Thom Hammond at Hammond Cox Casting for best casting in a commercial.

John Simm will be reprising his role as villain The Master in the upcoming 10th season of BBC’s Doctor Who, the network announced on Thursday (April 6).

John – who currently stars in ABC’s The Catch – has portrayed The Master in five episodes of the British series from 2007 to 2010.

“I can confirm that it’s true,” John told the Radio Times. “Thanks to the power of time travel I’m back. It’s always a pleasure to work with this great team of people, and I can’t wait for you all to see what The Master gets up to in the next series.”

“Nothing stays secret for long on Doctor Who, but you’ll have to wait a little bit longer to see exactly what The Master is up to and how he makes his return to face the Doctor,” showrunner Steven Moffat added. “It’s been a huge pleasure to have fan-favorites John Simm and Michelle Gomez face-to-face in the same role! It’s not often you get to see a solo personality clash.”

Don’t miss season 10 of Doctor Who when it premieres on BBC America on April 15, and watch the latest trailer below!