Exclusive: Extended Walking Dead Sneak Peek Confirms Time Jump, Mass Casualties and Terrifying New Enemy That's 'From Inside!'

Michael Ausiello
The Walking Dead Season 4
The Walking Dead Season 4

Rick and his battle-weary society of survivors on The Walking Dead are about to get the last thing they need — a new freakin’ threat that is “not really walkers” nor is it “other people,” co-executive producer Denise Huth teases in the following extended preview of the AMC smash’s fourth season (bowing Sunday, Oct. 13). “The relative safety that they’ve created at the prison begins to fall apart.”

Um, if it’s not zombies, and it’s not humans… Then what the hell is it?!

PHOTOS | Fall TV Spoiler Spectacular: Exclusive Images and Scoop on The Walking Dead, Plus 44 Other Returning Favorites

“You can’t put your finger on where it’s going to come next,” adds EP Greg Nicotero, allowing only that “it’s from the inside.”

That ominous spoiler is but one of the many newsworthy nuggets dispensed in the four-minute video, which, in addition to featuring interviews with the cast and EPs, includes a generous amount of never-before-seen footage. Among the highlights:

VIDEO | Walking Dead DVD Exclusive: The Lost Season 3 Scene That Will Have Carol-Daryl Fans Swooning

* New showrunner Scott M. Gimple reveals the length of the time jump between Seasons 3 and 4.
* We get a first look at Carl interacting with his new age-appropriate friends.
* Michonne cracks a smile, and it’s directed at [spoiler].
* Carol forms a (presumably unaccredited) day school, featuring the popular class Knife Fighting for Self Defense.

Press PLAY below and then hit the comments with an answer to these Qs: What aspect of TWD S4 are you most looking forward to? And what’s the new threat?!

Related stories

TVLine's Performer of the Week: The Little Actresses Playing Breaking Bad's Holly

TVLine Items: AHS: Coven's Lange-tastic New Promo, AMC's Big Bad Marathon and More!

AMC Super-Sizes Breaking Bad's Final Two Episodes — Plus: Check Out the Farewell Poster

Get more from TVLine.com: Follow us on Twitter, Facebook, Newsletter