William MacDonald

When Mulder and Scully investigate a possible UFO crash site, Mulder is arrested and meets a man in jail obsessed with UFOs. When Mulder is released, he goes back to the crash site to see if there was a government cover-up operation.

Oliver is promoted to Acting Staff Sergeant and a new rookie joins the force.

Two deaths are attributed to a human-sized parasite and the case leads officials to rethink the closing of the X-Files.

Mulder and Scully track a serial killer whose gruesome MO includes leaving many victims but few clues.

After she finds a human skull in the basement of her current project, Shannon sets out to discover who is behind the mysterious death by piecing together clues left behind in the victim's hidden diary.

Emma is hired to consult on the acquisition of a castle-like estate that local legends claim carries a curse.