In the season three finale, Clark was enticed by a Kryptonian girl, Kara, who had been sent to bring him home. After being pulled violently into the cave wall, Clark was trapped in a phantom zone.
As Season 4 begins, Clark seems to have resurfaced in Smallville, but is it really Clark or his alter ego, the emotionless Kryptonian Kal-El?
Breaking the show's long-standing rule, 'No Flights, No Tights,' Clark/Kal-El will soar up into the sky for the very first time.
Continuing the tradition of introducing well-known characters from the Superman mythology, Clark will also encounter the speedster known as The Flash and answer the long-time question: Who is the fastest teen alive?
Clark's world is turned upside-down as another landmark moment happens this season: The introduction of Lois Lane (newcomer Erica Durance). Expect the unexpected, when Lois' quick wit and dazzling beauty catch Clark totally off-guard.
While someday Lois and Clark will be the perfect match - as teenagers, they are oil and water, much in the same way Smallville has successfully surprised everyone by making Lex and Clark - future arch-enemies - the best of friends.
Lana returns from Paris with a mysterious tattoo and a new love – Jason. After Lois finds Clark, she brings him home, even though he has amnesia.
As the season progresses, Clark rejects his Kal-El self and his friendship with Lex Luthor starts deteriorating.
Smallville was developed for television by Alfred Gough and Miles Millar, based on the DC Comics characters. Kelly Souders and Brian Peterson, Todd Slavkin and Darren Swimmer serve as executive producers, along with James Marshall, Mike Tollin, Brian Robbins and Joe Davola.
The series is produced by Tollin/Robbins Productions and Warner Bros. Television. Superman was created by Jerry Siegel and Joe Schuster.