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HBO is expanding the Westeros universe. Deadline reports director SJ Clarkson and several new cast members, including Jamie Campbell Bower (pictured), have joined the network’s Game of Thrones prequel pilot.

As reported earlier, the network has ordered a pilot that will be set in Westeros thousands of years before the events of Game of Thrones. The fantasy drama “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.”

In addition to the previously announced Naomi Watts and Josh Whitehouse, Jamie Campbell Bower, Naomi Ackie, Toby Regbo, Denise Gough, Sheila Atim, Ivanno Jeremiah, Georgie Henley, and Alex Sharp have joined the cast of HBO’s Game of Thrones prequel.

Also, SJ Clarkson has been announced as the director for the HBO pilot, which comes from writer Jane Goldman and George R.R. Martin.

What do you think? Are you a fan of Game of Thrones? Would you watch the prequel series?