Designers: Charles Atlas, Power Boothe, Beverly Emmons, David Ferri, Kathryn Kaufmann, Mark Lancaster, Susanne Poulin, Stan Pressner, Philip Sandström, Jennifer Tipton, Howard S. Thies, Philip Treviño and Kyle Chepulis
Flex is in part a parody of Charles Atlas' long-running "The Insult that made a Man out of Mac" advertisements seen in American comics from the past.
His character portrayed the Charles Atlas-like character from those "tired of bullies kicking sand in your face and stealing your girlfriend"-type of advertisements that were in a lot of comic books during the 50's and 60's.
Charles Darwin | Charles Dickens | Charles, Prince of Wales | Ray Charles | Charles II of England | Charles I of England | Charles Lindbergh | Charles de Gaulle | Charles II | Charles | Charles I | Prince Charles | Charles V | Charles Scribner's Sons | Charles Aznavour | Charles University in Prague | Charles Stanley | Charles Bukowski | Charles Mingus | Charles Ives | Charles Bronson | Charles Babbage | Charles III of Spain | Charles Cornwallis, 1st Marquess Cornwallis | Charles Baudelaire | Charles Sanders Peirce | Charles River | Charles Manson | Charles Laughton | Charles Dutoit |
Charles Atlas company president Jeffrey C. Hogue was unhappy with its likeness being used this way, and filed a trademark infringement suit against DC Comics.