The now - adult Billy Batson is physically indistinguishable from his Captain Marvel form ; Luthor 's compatriots believe that it is Captain Marvel who attends Luthor 's needs .
Captain Marvel : Luthor 's brainwashed houseboy .
The now - adult Captain Marvel   is physically indistinguishable from Captain Marvel 's Captain Marvel form Luthor Luthor 's compatriots believe that it is Captain Marvel who Luthor Luthor 's needs .
Captain Marvel : Luthor 's brainwashed houseboy .