The Walking Dead stars Andrew Lincoln (Rick Grimes), Norman Reedus (Daryl Dixon), and Chandler Riggs (Carl Grimes) grace the cover of Entertainment Weekly's print issue this week with three separate collectors covers, leading up to the show's appearance at Comic-Con 2013 on Friday, July 19. In addition, they have released a first look photo of Larry Gilliard Jr. (The Wire) as Bob Stookey, who joined the cast back in April.

Take a look at these photos, then read on to see what showrunner Scott M. Gimple had to say about the latest threat facing this group of zombie survivors this season. We also have a look at The Walking Dead Chop Shop, which allows you to custom build your own zombie survival machine.

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Scott M. Gimple, who was promoted to showrunner back in January, teased a threat that actually comes within the walls of the group's fortified prison itself.

"The new threat is something you can't just stab in the face. You can't talk sense to it. You can't make a truce with it. It's beyond all that. It would be a threat in any world, but in this world it is much more terrifying."

It is possible that there is a new viral illness that threatens the safety of the group, especially after last week's set photo with Norman Reedus fashioning a bandana around his face.

Larry Gilliard Jr. plays former Army medic Bob Stookey, who, in Robert Kirkman's comic book series, was a member of the Woodbury colony, although in the series, he is found by Daryl Dixon about a week before Season 4 starts. Here's what Scott M. Gimple had to say about the character.

"His backstory is not entirely the same as in the comic and the novel. I think he's seen things go bad over and over, and winding up in this stable place doesn't shake him from his experience. He struggles with that."

Larry Gilliard Jr. himself added that viewers will sense that Bob Stookey has a dark past he is tormented by.

"You can see there's something deeper and darker that's going on with this character, just from the first episode. We don't really know what it is. We just know he's got some issues that he's dealing with."

Season 4 of The Walking Dead kicks off this October on AMC. To help you prepare, AMC and Hyundi have launched the online app The Walking Dead Chop Shop.

"This infection continues to spread. Walkers are everywhere. Inside, we've gathered 3 vehicles and nearly 300 parts. Use them to build your zombie survival machine. Choose wisely. And move fast. Your survival depends on it."

You can check out some of the photos from the site. To get started building your own zombie survival vehicle: CLICK HERE

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