Tuck Milligan

Mulder and Scully, reunited at last, head for an active volcano under a geological study and find a deadly life form that can survive in the searing heat of the crater and is killing the scientists to avoid being discovered.

When Carter finally comes face-to-face with Reese, he urges her to join forces to help with their latest Person of Interest, a young woman trying to turn her life around.

Detectives think the mutilated corpse of a med student links to Guatemalan drug trafficking, but the investigation leads them to a cosmetic surgeon on Park Avenue.

Flashbacks reveal Finch's creation of the machine; Reese hits the road, leaving the team to deal with the aftermath of their war with HR.

Multiple enemies target the team as they try to protect a dying man; Reese's absence could lead to catastrophic repercussions.

Dr Greene returns to San Diego to assist his father and finds out his mother has serious medical problems.