Walking Dead
Episode 4 of "The Walking Dead" will air on Sunday, Nov. 3 at 9 p.m. Gene Page/AMC

“Walking Dead” fans were left on the edge of their seats last week with episode 3, “Isolation.” The episode concluded with Daryl’s group being forced to ditch their car after running into a hoard of thousands of zombies; and Carol admitting to Rick that she was the one that killed Karen and David. Unfortunately things won’t be getting any easier for the prison group in episode 3, “Isolation.”

According to an episode description for “Isolation”: “The supply mission faces hurdles; the situation at the prison worsens.”

While the synopsis isn’t too revealing, sneak peek videos from the upcoming episode reveal a little bit more.

In the first sneak peek, “Walking Dead” viewers can see that Rick and Carol left the prison to go search for supplies. Heading into a house, Rick raids the place of all the medicine -- but it turns out that he and Carol aren’t the only ones in there. Their noise downstairs stirs a walker who trips down the stairs and nearly takes out Carol. The video ends with a door at the top of the staircase slowly creaking open … but whether the person behind it is human or walker has yet to be revealed.

In the second sneak peek video, fans can see that Daryl, Michonne, Bob and Tyreese managed to make it to some sort of school building (hopefully the veterinary school). But like Carol and Rick, they’re not alone. The mission group has to move quick because while the hallways may currently be cleared, the rooms are not.

Finally, the promo video for “Indifference” reveals that more will fall at the prison. The footage shows Rick watching from a corner while a bloody body is dragged around a corridor by a mysterious person.

Episode 4, “Indifference,” will air on AMC on Sunday, Nov. 3, at 9 p.m. What do you think will happen next on “The Walking Dead”? Let us know your thoughts in the comments section.

Walking Dead
Episode 4 of "The Walking Dead" airs on Sunday, Nov. 3 at 9 p.m. Gene Page/ AMC