7:43, with the rise of the zombies. "The walking dead" is one of the most popular shows on the tv. Millions of viewers tuning in every week. And renewed for another season, season five. What's behind... See More
7:43, with the rise of the zombies. "The walking dead" is one of the most popular shows on the tv. Millions of viewers tuning in every week. And renewed for another season, season five. What's behind our undead obsession? Abc's chris connelly has the story. Reporter: The idea, to imagine what life would be like, after a zombie apocalypse. Christ promised a resurrection of the dead. I just thought he had something a little different in mind. Reporter: But it's what millions of viewers want to see. Since halloween 2010, amc's "the walking dead," has been flushing out that scenario. And the show's been eating its cable competition alive. It's a show you watched going forward, people are flocking to this show because there's nothing quite like it. Reporter: Centers on a colony of survivors desperate to defend themselves against the zombies or walkers, who are ready to prey upon them, the series was just renewed on tuesday, for a fifth season. The positidecision, a no-brainer. It was the highest-rated telecast for a drama. This weekend, it beat sunday night football. This is a show that attracts 16 million people on the night that it airs. You factor in the dvr numbers over a couple of days, you're up to 20 million. Reporter: Once relegated to b-movie fair, as in the horror cult classic, "night of the living dead." Zombies got an unconventional REBOOT IN THE 1980s, WITH Michael jackson in the "thriller" video. But it's the 21st century that's seeing our appetite for zombies really kick in. In video games as call of duty block ofs. And movies as "28 days later" or "world war z." There's a lack of humanity to what used to be human. Reporter: The success of "the walking dead" proves, sometimes you're better undead than alive. For "good morning america," chris connelly, abc news, los angeles. Amc's -- already developing, a companion series. No shocker. It will be based on new stories and characters from comic book author, robert kirkman. So, more coming your way. And have another cup of coffee.
This transcript has been automatically generated and may not be 100% accurate.