Captain Boomerang is the name of two supervillains appearing in American comic books published by DC Comics, who respectively serve as enemies to both the Barry Allen and Wally West versions of the Flash. Created by writer John Broome and artist Carmine Infantino, the first Captain Boomerang, George "Digger" Harkness, first appeared in The Flash #117 (December 1960). He has also been a prominent member of the Suicide Squad since its second iteration in the late 1990s. During the 2004 storyline Identity Crisis, George Harkness is killed and his son, Owen Mercer, created by Brad Meltzer and Michael Turner, takes over his father's role as Captain Boomerang for a period of time. However, during the 2009–2010 Blackest Night storyline, Owen is killed and Harkness returns to life, resuming his role as Captain Boomerang, and, overwhelmed by grief and rage, evolves as a dangerous threat after the loss of his son. Both Harkness and Mercer have been adapted from the comics into various forms of media, including television series, feature films, and video games. In particular, Harkness appeared in the Arrowverse television series Arrow, portrayed by Nick E. Tarabay, and the DC Extended Universe films Suicide Squad (2016) and The Suicide Squad (2021), portrayed by Jai Courtney. Additionally, Mercer appears in the Arrowverse series The Flash, portrayed by Richard Harmon. Publication history George "Digger" Harkness appeared in The Flash #117 (December 1960) and was created by writer John Broome and artist Carmine Infantino. Throughout the first several years of the character's existence, Captain Boomerang spoke with an American accent. Beginning in the late 1980s, he developed an Australian accent. Owen Mercer first appeared in Identity Crisis #2 (2004) and was created by Brad Meltzer and Rags Morales. Fictional character biographies George "Digger" Harkness Secretly the illegitimate son of an American soldier and an Australian woman, Harkness was raised in an Australian town called Korumburra in poverty, during which time he developed great skill in making boomerangs, and in using them as weapons. As a young adult, he was hired as a performer and boomerang promoter by a toy company which was, unbeknownst to him, owned by his biological father. It was at this time that he developed the Captain Boomerang persona that he would continue to use in his later criminal career. Audiences ridiculed him, and a resentful Harkness turned to using his boomerangs for crime. When he began committing crimes,