Here are the obvious, and not-so obvious, alums.

Weiss' new Netflix sci-fi series than those who show up in front of the camera.

Those names extend from production designer Deborah Riley to composer Ramin Djawadi.

John Bradley, 3 Body Problem

John Bradley as Jack Rooney in ‘3 Body Problem’.Netflix

Though, there are even more vets who made appearances in the adaptation than you might think.

“We wrote [the part] for him before we even told him,” Weiss says.

“Well, we said, ‘Don’t take another job.

Liam Cunningham, 3 Body Problem

Liam Cunningham as Wade in ‘3 Body Problem’.Ed Miller/Netflix

We have something for you,'” Benioff adds.

“The real John is very funny, very caustic, sarcastic.

We also had the pleasure of going to the Oxford Speakers Union.

Jonathan Pryce, 3 Body Problem

Jonathan Pryce as Mike Evans in ‘3 Body Problem’.Ed Miller/Netflix

It was the two of us, Kit Harington, and John.

“The books describe Thomas Wade as being 40 years old, devastatingly handsome, resembling Hugh Jackman.

“It was a perfect comp.”

Conleth Hill as Varys on ‘Game of Thrones’

Conleth Hill as Varys in ‘Game of Thrones’.Helen Sloan/HBO

“There are a lot of other people we’d love to work with,” Benioff says.

“It kind of feels like, ‘Well, why guys?

Those guys are your favorites.’

Mark Gatiss Game of Thrones

Mark Gatiss as Tycho Nestoris in ‘Game of Thrones’.Hbo/Kobal/Shutterstock

It has to be the right role.

Conleth Hill, who played Lord Varys (a.k.a.

the Spider), pops up in a very small role as the Pope.

A version of the Pope that appears within an alien-made VR game.

Hill shares a scene with Hong and Bradley.

“Obviously, he thought it was fine.”

He takes it seriously,” Benioff recalls.

“We had a role for the Pope.

It’s quite the earthly Pope.

We were like, ‘This isn’t sacrilegious.

It’s a fake Pope on an alien planet.

It’s got nothing to do with the actual Catholic church.'”

Mark Gatiss

Hbo/Kobal/Shutterstock

Bradley revealed the finalGame of Thronesactor making a comeback: Mark Gatiss.

Gatiss played the role of Tycho Nestoris onGame of Thrones.

“You would’ve been in a scene with me!”

“In the Bank of Braavos.”

3 Body Problemdrops on Netflix March 21.