As the latest installment of AMC's zombie apocalypse, "The Walking Dead," airs on a recent Sunday night, Chris Hardwick calmly sits in a slightly tacky living room set in a small studio at CBS Television City. He silently reviews his notes on his iPhone and strategically positions his interview cards as the crew bustles around him and a (human) audience waits quietly in nearby bleachers.

The episode ends with a major character in dire straits - Andrea (Laurie Holden) is shackled and bound in a torture chamber devised by her ex-lover, the evil Governor (David Morrissey). As the final credits roll, the lights come up in the studio and Hardwick's somewhat incredulous expression is beamed live to the legions of "Walking Dead" viewers.

As the camera zooms in, Hardwick, wearing tennis shoes, a kaleidoscopic tie and a black jacket that looks a half-size too small, turns into "Dead" man, talking.

"Are you kidding me with that?" exclaims the 41-year-old comedian, host of AMC's surprise hit zombie chat-fest "The Talking Dead." "Andrea is being held captive in the chamber of horrors? What happens now?"

Broadcast directly after the phenomenally successful "The Walking Dead," "The Talking Dead" took on a life of its own this season, evolving from a half-hour companion show into a full-fledged, hour-long monster mash whose ratings in the coveted 18-49 demographic surpass a host of prime-time shows on the major networks.

Armed with an unabashed geek love for the series, Hardwick gleefully dissects every bite and slice from each episode while also juggling a panel of celebrity guests - all either associated with or just fans of the mother show. Led by Hardwick, who also hosts BBC America's cult favorite "The Nerdist," the panel dives into "Walking Dead" trivia, behind-the-scenes featurettes, and fields questions from viewers both in-studio and via email and phone calls.

"It's like a post-game show for the Super Bowl," said Brad Adgate, an analyst for New York-based ad firm Horizon Media. "This show has really capitalized on the power of social media. 'The Walking Dead' is one of the most popular shows on Twitter and Facebook, and this devoted following has always elevated 'The Talking Dead.'"

The March 24 episode of "The Talking Dead" averaged 4.5 million viewers, an increase of its weekly average of 3 million viewers. The midway point of the third season in February drew in 4.1 million viewers. Executives say about half of the audience for "The Walking Dead," which just concluded its third season, stays tuned for "The Talking Dead."

Joel Stillerman, AMC's head of original programming, said he thought "The Talking Dead" would find its audience when it launched in the second season, "but I would be lying if I said I thought we would get these kinds of numbers. To see how it's grown is really a testament to the show, and to Chris. There's just this incredible energy surrounding the show in social media."

Even more significantly, "The Talking Dead" is one of the least expensive series on AMC's prime-time slate - the set is spare, there's no band and the production is low-frills. While declining to say how much the show costs, Stillerman said "it's a good business model. We get a nice return on our investment."

The foundation of "The Talking Dead," of course, is conversation, which flows from a loose talk-show format. It isn't hard to book popular guests - in addition to Holden, other visitors include Robert Kirkman, who created the comic book series on which the show is based, and other writers, rocker Dave Navarro, writer-director Kevin Smith and comedian Patton Oswalt.

The only requirement for guests is that they be genuine fans of the graphic novel or the show - "The Talking Dead" is not the place for celebrities to hype their latest project. For instance, Aisha Tyler, who co-hosts the daily syndicated "The Talk" and is one of the voices on FX's animated comedy "Archer," did not mention those shows on her recent appearance (but Hardwick did plug her "Girl on Guy" pod cast).