Beatrice Zeilinger

Dr Shaun Murphy encounters a young patient who looks eerily similar to his deceased brother. Shaun discovers his parents hid his diagnosis from him, and the team must find the cause of their patients' increasingly severe allergic reactions.

Mulder must find a way to capture an alien bounty hunter who has been murdering doctors and has kidnapped Scully.

After a suicide attempt and multiple murders at a military hospital, Mulder and Scully meet a quadruple amputee who has gained the power of astral projection, and takes out his personal frustrations on his commanding officers.