Origin

Clive Sigerson is an actor whose roles include the lead in a Sherlock Holmes play. At one point he was knocked on the head by the Joker and believed himself to be the real Sherlock Holmes. Along with assistant, a stage hand named Watson, Clive tracked down the Joker and brought him to justice.

Although Clive seems like a average man and actor, when he thinks he is Sherlock his sense of logic and reason become close to that of the real Sherlock Holmes.

Creation

Clive Sigerson was created by Dennis O'Neil for his run on The Joker, and only appeared in one issue, Sherlock Stalks the Joker.