Firefly (Garfield Lynns) is a fictional character in DC Comics created by France Herron and Dick Sprang. He first appeared in Detective Comics #184 (June 1952) and is an enemy of Batman.
Firefly is introduced as Garfield Lynns, a down-and-out film visual effects expert who attempts to rob a theater by faking a fire, only to be stopped by Batman and Robin. He escapes, and in the darkness Batman sees a distant firefly, which he mistakes for Lynns' lit cigarette and chases in the wrong direction. Inspired, Lynns becomes The Firefly, using various lighting effects and optical illusion in his crimes.
As a costumed criminal, Firefly has fought not only Batman and Robin, but also the Creeper and the Outsiders.
The second Firefly is Ted Carson, an ostensibly wealthy gold-mine heir who gambles away the family fortune and turns to crime to maintain his lifestyle. He is also Bruce Wayne's rival for the affections of Kathy Kane, aka Batwoman. His first appearance is in Batman #126, Sept. 1959.
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Official Site: D.C Comics
Links: Wikipedia D.C Database Project Dark Knight