Jonny Double is a comic series written by Brian Azzarello and published by the Vertigo imprint of DC Comics. The series was based on the Jonny Double character, created in 1968 by Len Wein and Marv Wolfman. It was the first collaboration of Azzarello and artist Eduardo Risso, which subsequently led to a successful and longstanding pairing on 100 Bullets. Source: Wikipedia (en)