Season 4
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.
Episodes
Mark battles enemies new and old in his fight to keep Earth safe.
Loyalties are challenged when an old enemy is revealed.
Consequences weigh on Mark. Oliver takes on a new job.
Hurm.
Mark embarks on a new and dangerous mission, throwing Debbie into a tailspin and plunging Eve into uncertainty.
Family bonds are put to the test. Under pressure, Allen makes a new friend.
Nothing goes according to plan during a massive confrontation.
Mark confronts his darkest fears as his life changes forever.
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