Doggett comes upon an old case that Mulder kept secret from Scully, and decides to investigate it in more detail hoping to somehow find a link to Mulder's possible whereabouts. But while investigating Doggett stumbles onto something that he never knew about Mulder but all of this information comes at a high price when his life is put in danger.

When Scully and Doggett are contacted by a man who claims his wife was murdered shortly after giving birth to an alien baby, Scully digs deeper into reports of alien fertilization on humans and begins to question her own pregnancy and its conception.