The Borg return with a new way to travel through subspace and a vicious attitude that triggers strong feelings in the formerly emotionless Data.

Not knowing whom they can trust, a reunited Mulder and Scully must continue their investigation without the help of the FBI.

A tip from Krycek leads Mulder and Scully to a Martian meteorite fragment containing an alien life form.

Mulder uncovers more clues about a government cover-up involving an alien entity and a sunken World War II aircraft. Scully pursues the man who murdered her sister.

Mulder and Scully continue investigating a smuggler while wrestling their way out of a web of intrigue.

Scully confronts a new threat to her life as Mulder probes a series of horrific mass killings, which leads him to evidence of extraterrestrials.

Mulder is drawn into a dangerous confrontation with creatures that could expose the conspiracy surrounding extraterrestrials.

The agents are drawn into an investigation following an attempted assassination as someone from Mulder's past conflicts with Scully.