'The Walking Dead' Exclusive Sneak Peek!

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Things are looking grim for our embattled band of survivors on The Walking Dead and Sunday's race for the cure promises to put even more of your favorite characters in peril!

VIDEO - The Walking Dead Cast Previews S4's Biggest Shockers 

ETonline scored this exclusive photo from this week's all-new episode, titled Indifference, which sees Daryl and the team tracking down medical supplies come up against several deadly hurdles in their quest to eliminate this epidemic.

"He's the type of guy who will do anything to keep you alive and keep you safe," star Norman Reedus told ETonline of his character's antidote adventure. "He found a sense of self-worth through these people; he was destined to become mini-Merle and he was ashamed -- but he didn't become that guy, so he'll do whatever it takes to save his people."

The Walking Dead airs Sundays at 9 p.m. on AMC.