When a boy who can make people lose their memories robs the Talon, Clark goes after him but gets total amnesia. Chloe finds out what happened and has to tutor Clark in the use of his superpowers and make sure he doesn't accidentally reveal his secret. While Clark, Chloe, and Lois try to track down Kevin, Clark takes advantage of his "new life" to ask Lana on a date. And Lex tries to turn Clark's memory loss to his advantage by getting him to reveal the secret of the caves.
Season 4 Episode 19 of Smallville resulted in a 0.00 rating in the 18-49 demographic.
s04e01 - Crusade
s04e02 - Gone
s04e03 - Facade
s04e04 - Devoted
s04e05 - Run
s04e06 - Transference
s04e07 - Jinx
s04e08 - Spell
s04e09 - Bound
s04e10 - Scare
s04e11 - Unsafe
s04e12 - Pariah
s04e13 - Recruit
s04e14 - Krypto
s04e15 - Sacred
s04e16 - Lucy
s04e17 - Onyx
s04e18 - Spirit
s04e19 - Blank
s04e20 - Ageless
s04e21 - Forever
s04e22 - Commencement
Smallville tells the tale of a teenage Clark Kent in the days before he was Superman. It is the town where he came from where very strange things started happening with his arrival in a spaceship in the midst of a meteor storm of green rocks.
Clark must deal with a variety of individuals given powers by the green rocks, keep his powers a secret, cope with his friendship with a young Lex Luthor, and balance the two girls in his life, Chloe and Lana. The show also shows us how Lex Luthor develops from a friend of Clark's and kinda-okay guy to (presumably) the villain who will plague Superman in his later years.