Game of Thrones Just Confirmed 36 Recast Stars for the Mad King Prequel
Dragons are set to rule 2026: after the explosive, critically acclaimed debut of A Knight of the Seven Kingdoms, HBO’s Westeros saga is already stoking the next fire-breathing chapter.
Game of Thrones isn’t slowing down in 2026. We just got A Knight of the Seven Kingdoms season 1 a few months back (critics dug it ), House of the Dragon season 3 lands on HBO Max in a few weeks and is being sold as the biggest season yet, and now there’s another prequel on the way—only this one won’t be on TV. It’s heading to the stage.
Yes, they’re putting Westeros on stage
George R.R. Martin confirmed on his blog that a new prequel play, titled Game of Thrones: The Mad King, is happening. It’s set in the final years before the books kick off and will run July 20 to September 5 at the Royal Shakespeare Theatre in Stratford-upon-Avon. If all goes well, they’re eyeing a Broadway transfer after that. That’s ambitious, but also kind of perfect for this story.
What story are we actually getting?
The play is adapted by Duncan Macmillan from Martin’s work and zeroes in on the Tourney at Harrenhal—a loaded moment for the realm where a lot of future disasters quietly start. If you need a refresher: this is where the Lyanna Stark and Prince Rhaegar Targaryen situation escalates. The production digs into their relationship, how they end up running off together, and the dominoes that fall after—Robert’s Rebellion, a kingdom at war, and eventually the birth of Jon Snow. You know, light stuff.
Who’s playing who
The cast is big, and it needs to be for a story stacked with Starks, Targaryens, Lannisters, and Martells. Here’s the lineup:
- Harmony Rose-Bremner as Lyanna Stark
- Noah Ritter as Prince Rhaegar Targaryen
- Michael Abubakar as Ned Stark
- Callum Woodhouse as Lord Robert Baratheon
- Michael Shaeffer as King Aerys II Targaryen (the Mad King)
- Luke Brady as Brandon Stark
- Alexander Newland as Lord Rickard Stark
- Miles Barrow as Benjen Stark
- Mariah Gale as Queen Rhaella Targaryen and Lady Shella Whent
- Marcello Walton as Ser Jonothor Darry and Lord Tywin Lannister
- Maxim Ays as Ser Jaime Lannister
- Daisy Franks as Cersei Lannister
- Edem-Ita Duke as Oberyn Martell
- Elizabeth Ayodele as Princess Elia Martell
- Hughie O'Donnell as Lord Varys
- Kel Matsena as Ser Arthur Dayne
- Daniel Hawksford as Ser Barristan Selmy
- Richard Hansell as Grand Maester Pycelle
- Marty Breen as Catelyn Stark
- Tanisha Spring as Ashara Dayne
- Islam Bouakkaz as Howland Reed
- Adrian Christopher as Prince Lewyn Martell
- Shaun Yusef McKee as Ser Gerold Hightower
- Huw Parmenter as Ser Oswell Whent
- Sebastian Charles as Owen Merryweather
- Fred Davis as Qarlton Chelsted
- Tom Larkin as Lord Whent and Wisdom Rossart
Why this one matters
This isn’t just a side quest. Harrenhal is where a lot of the main series’ backstory snaps into focus—Ned and Lyanna, the Targaryens imploding, and the Lannisters circling. Putting it on stage is a swing, but the Royal Shakespeare Theatre knows how to handle sprawling, messy dynasties. If they nail Lyanna and Rhaegar, the rest falls into place.
So, to recap: the Thrones universe is hopping between TV and theater this year—A Knight of the Seven Kingdoms already landed well, House of the Dragon season 3 is almost here, and The Mad King is about to put the spark that lit Robert’s Rebellion right under a spotlight. Honestly, it’s a smart way to revisit a pivotal chapter without retreading the same battles we’ve already seen on screen.