The series recounts the early adventures of Kryptonian Clark Kent as he adjusts to life in the fictional town of Smallville, Kansas, during the years before he becomes Superman.

His distrust for Lex continues to grow, as Clark's professor begins supplying him with evidence of LuthorCorp's secret projects.

Jensen Ackles, who played Jason Teague, left the show after season four, and Erica Durance became a series regular as Lois Lane.

The writers also brought in Arthur Curry, Victor Stone, and Andrea Rojas, DC Comics superheroes, in three separate guest spots as well as the classic Superman villain Brainiac.

Since the second season, a promotional tie-in titled Chloe's Chronicles was established to wrap up "unfinished business" from the television series through the use of internet episodes.

[29] Guest star Emily Hirst was nominated for a Young Artist Award for her portrayal of Maddie Van Horn in "Fragile".