Main characters in Smallville discovered Clark Kent's Superman secret at different times, complicating his relationships. Superman's morality contrasted with Clark Kent's need for secrecy, leading to tension and eventual reveals. Despite not fully becoming Superman in the show, Clark's evolution into the hero was a central theme of Smallville.

Each of the main characters in Smallville discovered the truth about Clark Kent (Tom Welling) being Superman at very different times in the series. Like most superhero stories, one of the most important elements of Smallville was Clark's secret identity. Since the pilot episode, Clark tried to protect the secret of his powers and his Kryptonian heritage from the people around him, but there were times when Clark either failed to hide the truth or was compelled to come clean.

Because of Superman's morality, he'll always be known as the Big Blue Boy Scout, but throughout most of Smallville, Clark...