'A Knight of the Seven Kingdoms' just revealed Egg's true identity. And yes, that prophecy comes true in the books.

Peter Claffey and Dexter Sol Ansell as Dunk and Egg in "A Knight of the Seven Kingdoms."

Steffan Hill/HBO

• Warning: Spoilers ahead for "A Knight of the Seven Kingdoms" episode three, "The Squire."
• The new "Game of Thrones" spinoff just revealed its first big twist.
• The episode also includes an Easter egg about Egg's future in Westeros.

Spoilers ahead for "A Knight of the Seven Kingdoms" season one, episode three, "The Squire," and the book "The World of Ice & Fire."

So far...