'Walking Dead' Reveals 'Insane' Comic-Con Trailer

The Governor, zombies and new threats await Rick Grimes and friends in season four, according to the 'Walking Dead' cast and crew.

"It's going to get insane very quickly."

That's the head's up from showrunner Scott M. Gimple when it comes to the new season of "The Walking Dead." And you might want to take "head's up" literally: AMC's zombie series is never afraid to let the blood flow, as illustrated by the new trailer debuted at Comic-Con.

During Friday's "Walking Dead" panel, the cast and crew unveiled a new trailer featuring a mix of familiar faces and new ones. Last season's newbies Tyreese (Chad L. Coleman) and his little sister Sasha (Sonequa Martin-Green) are now full-fledged members of the prison-dwelling group, fighting zombies alongside Norman Reedus' Daryl Dixon and Steven Yeun's Glenn through a shopping center. Indeed, the prison is healthily populated and organized -- at least until some mysterious party attacks floods a cellblock with walkers, killing many in the process: "twelve of our own," according to Hershel (Scott Wilson).

"Step outside, you risk your life. Take a drink of water, you risk your life," Hershel tells his fellow survivors at one point in the trailer, in between action shots of Tyreese hammering zombies and even turning his fists against Rick at one point. "You don't have a choice: the only thing you can choose is what you're risking it for."

The trailer concludes with Daryl, Tyreese, Michonne (Danai Gurira) and new character Bob Stookey (played by "The Wire" alum Lawrence Gillard) riding in a car together, shocked as a voice comes over the radio promising sanctuary.

"Those who arrive, survive," the voice promises.

Indeed, despite a peaceful beginning, it looks like season four will quickly explode with all the drama and trauma "Walking Dead" fans have come to love and fear. As Chad Coleman put it during the panel, "No one goes unscathed. Eventually a can of whoop ass opens."

What role does the Governor play in opening up that can? It's unclear; the one-eyed psychopath was completely absent from the new trailer, though it's worth wondering if he's the man responsible for attacking the prison cellblock.

"All bets are seriously off," series creator Robert Kirkman warned about the Governor's role in the future of the show.

"The Walking Dead" returns for its fourth season on October 13, 2013.