LEX DECIDES TO UNDERGO RADICAL TREATMENT TO REGAIN HIS MEMORY – Believing that key information about his father’s past was lost when his memory was erased, Lex decides to join an experimental program with Dr. Garner to regain the information so he can turn his father over to the FBI. Knowing that Lex will discover his secret if he regains his memory, Clark tries to stop him but is caught by Lionel and the doctor and exposed to the same radical treatment so that Lionel can solve the mystery of Clark’s past.
CLARK AND LANA TRY TO KILL CHLOE – Clark and Lana each make an attempt on Chloe’s life for unknown reasons after they receive a mysterious e-mail from the Sommerholt Institute. Clark must discover the source of these e-mails after Chloe reveals she has uncovered proof that they are doing mind-control research at the lab and realizes they must be trying to kill her in order to prevent her from writing an expose. Meanwhile, Lana decides to rent the apartment above the cafe to Adam even though she feels he is hiding something dangerous about his past.
The plot continues to develop the show’s mythology, as Clark meets up again with Ryan, a teenage mind reader the Kents befriended last season. This time, Clark tries to protect the teen from a scientist who has been conducting cruel experiments on the boy. Meanwhile, Lex crosses swords with Smallville’s corrupt mayor over a potential business deal that could have serious ramifications for the town.