Season 3 of "The Walking Dead" was a deadly one, with the survivors losing T-Dog, Lori Grimes, Merle Dixon and Andrea.

In the finale, The Governor went on the lam and the Woodbury survivors moved into the prison where Rick's (Andrew Lincoln's) group was holed up.

If you think there's safety in numbers, think again. Check out the new, four-minute sneak peek of Season 4, which just debuted at Comic-Con. Not only are the survivors continually threatened by zombies (who are increasing in number), but it looks like there's a threat from inside the prison that will tear the group apart. Enough talking, more watching:

It looks like new regulars Chad Coleman (Tyreese) and Sonequa Martin-Green (Sasha) will be getting plenty more screentime, with Tyreese finding himself in lots of trouble -- in the form of a herd of walkers!

We also get our first look at Larry Gilliard Jr.'s character Bob Stookey, a former army medic.

And of course, Carol Peletier (Melissa McBride) is in danger ... again! Season 4 of AMC's "The Walking Dead" premieres Sunday, October 13, 2013. In the meantime, vote for the most shocking moment of Season 3, below:

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