The Flash (Barry Allen), commonly known as the "Fastest Man Alive", is a young and popular superhero from Central City and a founding member of the Justice League. Apart from his vast speed powers, Barry's most significant qualities were his approachability and his down-to-earth, quintessentially human nature—qualities that many said made him the "heart of the Justice League".

In his civilian life, Barry Allen worked as a forensic scientist with the Central City Police Department.