'Game of Thrones' Season 8 Premiere: John Bradley Reacts to Sam Spilling the Truth to Jon Snow! (Exclusive)

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WARNING: We’re about to discuss the final scene from Game of Thrones’ season eight premiere. If you have not watched the episode or do not wish to be spoiled, hop on the nearest dragon and fly the hell out of here! For everyone else, brace yourselves because…

You know everything, Jon Snow!

In Sunday night’s season eight premiere of Game of Thrones, Samwell Tarley (John Bradley) was the unlucky man who had to break the truth to Jon Snow (Kit Harrington) about his true identity as Aegon Targaryen – the son of Rhaegar Targaryen and Lyanna Stark.

"You've never been a bastard, You're Aegon Targaryen -- true heir to the Iron Throne," Samwell told Jon in one of the final scenes of the episode. "You're the true king. Aeigon Targaryen. Sixth of his name. Protector of the realm. All of it."

We caught up with star Bradley at the Game of Thrones junket in New York earlier this month, and the actor opened up exclusively to ET about Sam's big truth-telling moment.

“It’s a big thing to tell someone -- I come from Manchester and I never had to tell anybody that,” Bradley said with a laugh.

Game of Thrones
HBO

“If Jon is gonna find out that key piece of information, he'd rather hear it from Sam than anybody else because he knows that Sam is the person who will be doing it for the right reasons and he's not got an agenda.” Bradley explained. “He's not trying to cause trouble. He's just telling him because he feels he needs to know.

“So as far as Jon goes, if he has to hear you've been doing... you'd rather have your loyal and honest best friend tell you,” the actor concluded.  

During their bombshell-filled conversation in the Stark family crypt, Sam did not explicitly point out that Jon is currently dating his aunt Daenerys -- but something tells us that Jon has already figured out that his family tree is filled with some pretty twisted branches.

Bran Stark is the only other person who knows of Jon’s true identity, but Isaac Hempstead Wright is looking to give his on-screen cousin the benefit of the doubt.

“I mean of all the incest in Game of Thrones, it's not so bad,” Hempstead Wright stressed with a smile. “It's a couple of degrees removed.”

Liam Cunningham, meanwhile, joked that the Lord of Light must be "pretty progressive" to embrace all the incest on the show.

"We try not to talk there's a lot of (whistling) when he walks in the room," he joked of how Ser Davos handles the news going forward. "I don't really want to bring it up really with him."

Game of Thrones’ eighth and final season airs Sundays at 9 p.m. EST/PST on HBO