Sonoya Mizuno stars as Mysaria, also known as White Worm, in Season 1 of House of the Dragon. Pic credit: HBO/Ollie Upton Episode 4 of House of the Dragon offered plenty of intrigue and scandal.

House of the Dragon episode 4, "King of the Narrow Sea," mentions someone known as the White Worm. Here is the identity of that character according to the book.

I believe the White Worm will play a larger part in HBO’s House of the Dragon that she does in the book. Not that this will save her in the end. But for now, the White Worm lives and is on Team ...

The White Worm played a big part in House of the Dragon’s ninth episode. The spymaster has had a subtle but important role in King’s Landing as the Game of Thrones prequel has gone on.

In the early days of House of the Dragon, Daemon Targaryen had a paramour named Mysaria. A former slave from Lys, Mysaria came to Kings Landing and became a trusted confidante of the Rogue Prince.

Warning – Spoilers for House of the Dragon episode nine ahead* In episode nine, the White Worm conceals Prince Aegon II ahead of his coronation. In one powerful line, she shocks Otto Hightower ...