The battle for survival against the Undead continues. Three weeks of highs and lows, and the group are celebrating their victories and nursing their hurts like never before.

They head out once more to a world where the threat comes from an altogether different foe, and in their darkest hour so far, the infection might just be their only ally as Marcy finally finds her role in the team.

But will Howie accept it? Will it tear them apart? Will they do the right thing?