Captain Dynamo (real name William Warner) is a fictional comic book superhero, created by writer Jay Faerber and artist Fran Bueno, who first appeared as a supporting character in Noble Causes: Extended Family #2 (June 2004) by Image Comics.Captain Dynamo was killed by the assassin Widowmaker in Noble Causes #18 (March 2006), and now serves as a posthumous background concept in the monthly series Dynamo 5.