Mitchell Kosterman

A series of sexually oriented murders that are identical, except that the killer appears to be both male and female, draws Scully and Mulder to an Amish-type community of people who may be alien in origin.

Mulder reluctantly accepts a new partner, Agent Alex Krycek, and they investigate the deaths of several Green Beret soldiers who participated in a sleep deprivation experiment during the Vietnam War.

Mulder and Scully investigate the possible return of an executed prisoner who vowed to avenge his death.

Mulder questions a former FBI agent (Darren McGavin) about an X-file case from the 1950s which may have involved his father.

Clark is staggered by his newfound ability to see through solid objects with X-ray vision, especially when he witnesses Lex Luthor commit a bank robbery. Elsewhere, a shape-shifting teenager threatens Lana.

After a bad cop sees Clark use his superpowers, he is compelled to join forces with the rogue officer to protect his secret identity. Meanwhile, an old flame makes an intriguing proposal to Lex.