Dr. Walden wakes up from his coma and tells Lex and Lionel that Clark is an alien; Chloe finds out Clark and Lana are together.
Scully and Mulder search for a murderer who is half-man and half-beast with an appetite for human flesh.
In summer 1999, Megan wants to be adventurous and makes fake IDs for the gang; in winter 1999, a burst pipe leads the Landrys and Isabella to a messy night at the Chambers house; Isabella wishes to help but is met with resistance from Megan.
After leaving their engagement party, Chloe and Jimmy are abducted by a psychotic jeweler. Once emotionally scarred by his wife's infidelity, the jeweler now kidnaps couples and subjects them to a kryptonite-enhanced lie detector that will shock them if they lie. Chloe is asked if she is in love with anyonMeanwhile, in an effort to find Chloe and Jimmy, Clark and Lois pose as a couple -- as such, they are then kidnapped and asked how they feel about each other.
Mulder and Scully are stalked by a deadly new life form that has invaded the bodies of a volcanic research team.