While the world recovers from the global catastrophe of last season, a changed Mark struggles with guilt as he fights to protect his home and the people he loves, setting him on a collision course with a powerful new threat that could alter the fate of humanity forever.
Everything changes as Mark is forced to face his past and his future, while discovering how much further he'll need to go to protect the people he loves.
After an earth-shattering betrayal, Mark fights to rebuild his life. In the face of apocalyptic threats, he discovers new allies and wrestles with his greatest fear - that he might become his father.