Matt Smith as Daemon Targaryen in "House of the Dragon" season two.
Theo Whitman/HBO
- There's a surprising cameo in "House of the Dragon" episode three.
- The episode sees Daemon Targaryen (Matt Smith) take control of the huge castle, Harrenhal.
- While there, he has a vision that leads to an unexpected appearance from a season one star.
Warning, spoilers ahead for "House of the Dragon" season two, episode three.
An unexpected "House of the Dragon" star just...