Bob White was a professional wrestler, constantly traveling the country to compete in matches. What was unknown to the general public, however was that he and his young friend, Terry Wake, were also secretly Nightmare and Sleepy, scourges of the underworld! The two regularly encounter crime and villainy wherever they journeyed.
Nightmare & Sleepy possessed no extraordinary powers, but Nightmare's frightening skeleton-like costume was designed to give them a psychological edge against criminals ( i.e. just like Bat-man ).
Nightmare would later trade in his skeletal costume in favor of a more traditional superhero outfit.
Nightmare and Sleepy appeared in Clue Comics 1-12, with two stories printed in no. 6. Nightmare also appeared in Clue Comics vol. 2 nos. 1-2 with a new origin and no sidekick.