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.
The murder of a homeless man, which is very similar in detail to a murder committed in 1947, leads Mulder and Scully to a legendary man-beast roaming the forest near Atlantic City.
Hunting for missing Amy, Jack faces cryptic encounters in Seattle. Meanwhile, young Madison's odyssey is obstructed and shifty Shepherd spreads discord.
A jeweller abducts Chloe and Jimmy, and subjects them to a kryptonite-enhanced polygraph to measure their feelings for each other; Clark and Lois pretend to be involved to lure out the kidnapper and find their friends.
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.