S5·E13 Deep Sleep

This pivotal episode brings Renee Palmer to a hybrid-infested hospital where comatose patients are being used as a food source for the Atavus. It is only when Renee is ultimately able to expose these atrocities that the FBI finally takes seriously the threat of the Atavus, who must feed on the life force of humans in order to survive. The FBI pledges to join Renee's crusade to destroy this formidable alien menace before they take over the world.