Conan at Comic-Con: 'The Walking Dead' and 'Game of Thrones' Collide!

Conan O'Brien is letting his geek flag fly at Comic-Con this year, taping his TBS talk show in San Diego all week and welcoming all sorts of great guests straight from the convention floor. And Friday’s show offered a doubleheader of nerd nirvana: Conan was joined by the casts of AMC’s The Walking Dead and HBO’s Game of Thrones. Both! In the same night!

Sadly, no, the two casts didn’t actually meet on-camera — which is probably for the best. If the world saw Norman Reedus and Maisie Williams playing ping-pong or something, the collective nerdgasm that followed might have torn a hole in the space-time continuum.

But it was a great show, nonetheless. Yahoo TV had a seat at the taping, so let’s run through the highlights — along with some stuff you missed on TV.

Video: Conan Takes a ‘Mad Max’-Themed Drive Down to Comic-Con

Conan’s monologue was, of course, Comic-Con-themed; he introduced himself as “Spiderman in the streets, The Flash in the sheets.” He joked that when he went to look in on the Game of Thrones cast in the green room, “they were all dead.” (Too soon, Conan.) And when he went to see the Walking Dead cast, “they were eating the bodies.”

He threw in the obligatory Star Wars joke, too, about the fact that J.J. Abrams is directing the new installment: “Fans were very excited… until they realized J.J. stood for Jar-Jar.”

Then we got a hilarious taped segment that supposedly took us inside the home of Game of Thrones author George R.R. Martin to see how far he’s getting with his latest book. But the security camera footage just showed Martin (or, rather, a husky impersonator) making bubbles, racing RC cars, playing bongos, and bouncing naked on a trampoline. So if you’re waiting impatiently for The Winds of Winter? Keep waiting.

Plus, sidekick Andy Richter gave us a nerd-friendly weather report, giving us the forecast in locales such as Middle Earth, Narnia, and Westeros — where the 5,000 year forecast calls for (you guessed it) lots and lots of winter.

Conan then brought out Walking Dead stars Norman Reedus (Daryl), Steven Yeun (Glenn), and Danai Gurira (Michonne); Reedus was filming the crowd on his phone as he walked out. Conan asked them about their best Comic-Con memories; Reedus remembered walking the floor dressed as the Stay-Puft Marshmallow Man from Ghostbusters, while Gurira proudly carried a clutch covered in Walking Dead imagery given to her by a Comic-Con fan.

Related: ‘The Walking Dead’ Season 6 Trailer: A Deep Dive Into the Insanity

Have the cast had uncomfortable encounters with fans, Conan asked? Of course! Reedus told about the time he was eating a sandwich on an airplane and everyone around him was filming him — and he had to finish eating it in the lavatory. Yeun recalled an awkward meeting with a fan at a men’s urinal; the fan broke “urinal code” to look Yeun in the eye and say, “Guess I should tell my friends I’m peeing next to Glenn.” And then he patted Yeun on the shoulder!

When Conan asked them if any of them ever get scared on set, Yeun giggled — but he did say the old Georgia cemeteries and churches they shoot in are spooky sometimes. “Ghosts are my number one no-no,” Yeun said. “Because everything is on their terms.”

Conan pressed them for some early Season 6 scoop, and Reedus promised “a lot of conflicts happening inside and outside those walls” and “a lot of Morgan.” Conan added that there’s a “rumor that one of you doesn’t get out of this season alive.” Andy piped up to quip: “People say that about you and me!”

Plus, Conan listed the total amount of walker kills for Daryl, Glenn, and Michonne — which put Michonne a distant third. But of course, Gurira joined the show later than the other two, and she actually leads all three in average kills per season. Take a bow (with your katana), Michonne!

Then it was time for nine (!) members of the Game of Thrones cast to take the stage. The Conan crew hustled to get 11 chairs on the stage for their segment; when Conan sat down with all of them, he joked, “Welcome to our version of The View.”

Do any of them worry about their character dying, Conan asked? Carice van Houten, who plays seductive fire witch Melisandre, replied: “I’m more afraid of whether I’m going to be naked.” And Alfie Allen (Theon) remembered bugging the GoT creators so much that they sent him a fake script where he died, just to mess with him. They even asked him: “How would you feel about being a zombie with no dialogue whatsoever?”

The crowd “awwww”-ed when Conan addressed Sophie Turner and said, “Sansa’s been through a lot.” Andy chided the crowd: “It’s not real, folks!” And Conan barked back at him, “Andy, no!” But Conan does wish that Turner and others could have a happy episode for once: “I was thinking you could have one episode where you’re like, 'That’s a good cookie!’”

Asked about opinionated fans, John Bradley-West (Sam) recalled being approached by a fan who wondered if Sam is barely surviving in the cold North, “Why are you still so fat?” He shot back: “We’ve got fire-breathing dragons, ice zombies, a woman gives birth to a cloud… what is it about me being fat that you can’t buy?”

Conan pointed out that Turner has grown up on the show (she was 13 when she started filming), and she remembered when she was 15 and her parents tried to give her “the talk.” She told them, “I’m on Game of Thrones! I don’t think I need any education!”

Related: ‘Game of Thrones’ at Comic-Con: Arya’s Blind Ambition, Stannis’s Fate, and More

But she has some secrets, apparently: When Natalie Dormer (Margaery) was defending her nerd cred by revealing she has a Dune tattoo, she started saying something about a conversation she was having with Turner in the Conan dressing room. Turner violently shook her head, though, stopping Dormer in her tracks. We never did find out what the big secret is; even the great Conan O'Brien couldn’t crack that code.

And here’s some of what you didn’t see on TV:

* The taping was preceded by a warm-up session designed to get the crowd hyped, with T-shirt giveaways and an audience dance contest (to “Baby Got Back” and “Bye Bye Bye”). And the warm-up comic even let it slip that “Conan is staying at the Red Roof Inn in Chula Vista.” So fans, if you want to catch a glimpse of your red-headed hero, you know where to go.

* Conan’s microphone cut out when he was listing all nine of the Game of Thrones cast members in attendance — presumably, from exhaustion.

* During commercial breaks, Conan grooved to the music from the Basic Cable Band, sipped water, and even took selfies with a few lucky members of the audience. He also took off his suit jacket every chance he got, even fanning his sweat-stained armpits with his note cards at one point. (It was hot in there.)

* Conan was taped in San Diego’s historic Spreckels Theatre, and its intricate architecture had the guests marveling, from TWD’s Reedus and Gurira to GoT’s van Houten and Liam Cunningham (Ser Davos).

* Reedus took more photos of the crowd during commercial breaks, along with a few snaps of his castmates and Conan and Andy. When Reedus turned to take Conan’s photo, Conan snarled into the camera, cracking up everyone on stage.

* Turner and Williams are famously good friends off-camera, and it showed: They were chatting excitedly with each other during breaks, and chair-dancing together to the sounds of the band.

* During the GoT segment, Andy sat next to Conleth Hill (Varys) and talked with him during commercial breaks — and the two could be brothers! Can we get Andy a bald wig and shoot some GoT parody videos?

* After the taping, every audience member was gifted with a Funko Pop figurine of “Zombie Conan” — which are quite valuable, apparently. Men outside were offering a hundred dollars for each figurine to the audience members as they exited the theater. But we held onto ours. Who knows when you might need a Zombie Conan by your side?

Conan airs weeknights at 11 p.m. on TBS.