On last night's episode of The Walking Dead Season 4, a new threat was revealed and it's going to have a huge impact on everyone at the prison. If you'd like a tease of what's ahead, we have photos and multiple preview videos from the third episode.

“In the highly anticipated new season, we find Rick Grimes (Andrew Lincoln) and the group fostering a thriving community in the safe haven of the prison. Sadly, in this brutal world, happiness is short-lived and walkers and outside threats are no match for danger brewing inside the fences. The group’s home and new way of life will be thoroughly tested, and their struggle to survive has never been so perilous. Season 4 also introduces several new characters including Bob Stookey (Lawrence Gilliard Jr., The Wire).”

Unlike the first two episodes, where we had dozens of photos, AMC only released two images this time around, but we hope to have more before the episode airs. This week, we have two exclusive features headed your way- comments from Gale Anne Hurd about the new threat and an exclusive interview with Vincent Martella to discuss his role in the first two episodes. Catch up on our recent coverage highlights by visiting the following links:

Episode 4.03: Isolation – "A group leaves the prison to search for supplies; the remaining members of the group deal with recent losses." Directed by Dan Sackheim, Written by Robert Kirkman.