captain boomerang (george "digger" harkness) is a fictional supervillain appearing in american comic books published by dc comics. the character is an enemy of both the barry allen and wally west versions of the flash. it was created by writer john broome and artist carmine infantino. captain boomerang first appeared in "the flash" #117 (december 1960). he has also been a known member of the suicide squad since its second iteration.