Firefly is a supervillain appearing in American comic books published by DC Comics. Created by France Herron and Dick Sprang, he made his debut in Detective Comics #184. Initially portrayed as a criminal who utilized lighting effects to commit robberies, Firefly was later reimagined as a sociopathic pyromaniac with an obsessive compulsion to start fires following Crisis on Infinite Earths' reboot of the DC Universe in the 1980s. This darker depiction of the character has since endured as one of the superhero Batman's most recurring enemies and belongs to the collective of adversaries that make up his central rogues gallery.

Mark Rolston is an American character actor, known for his supporting roles in such films as Aliens, Lethal Weapon 2, Prancer, The Shawshank Redemption, Rush Hour, The Departed, and the Saw film series, as well as Gordie Liman in The Shield (2003).