Patrick Keating

Clayton Jessup, a serial killer who targets happy families, is on the loose and looking to kill again, and the team must race against time to stop him before it's too late; Bex learns who she can and can't trust.

Clark must stop a kryptonite infected man, who turns the elderly and the sick into ashes; Lex's father uncovers his son's investigation into Clark and his family.

Lana tells Lex that their marriage is over; Clark goes after Lionel when he discovers the real reason that Lana married Lex.

Mulder and Scully investigate a computer genius's death.

Olivia joins forces with Sam Weiss to stop the devastation from spreading. Weiss reveals a secret about his family and the incomplete collection of information.