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Smallville is an American television series developed by writer/producers Alfred Gough and Miles Millar, and was initially broadcast by The WB. After its fifth season, the WB and UPN merged to form The CW, which is the current broadcaster for the show in the United States. The show features a regular cast of characters, which began with eight main characters in its first season. Since then, characters from that first season have left the show, with new main characters having been both written in and out of the series. In addition, Smallville features guest stars each week, as well as recurring guests that take part in mini story arcs that span a portion of a season. Occasionally, the recurring guest storylines will span multiple seasons.

The plot follows a young Clark Kent, in the fictional town of Smallville, Kansas, as he journeys toward becoming Superman; it also follows Lex Luthor's path to the dark side, and the two's friendship turned hatred for one another. As the series progressed, recurring guests are added to help move the overall storyline of the show, like the addition of the disembodied spirit of Clark’s biological father, or to provide a side-story arc for one of the main characters, like the creation of Adam Knight.

Source: Wikipedia