Spy had a long run in Detective Comics, starting with #1 (March 1937) and ending with #83 (January 1944).
Created by Jerry Siegel and Joe Shuster, whom later created Superman.
Bart Regan operated as a Secret Service agent for the United States government, and later as an undercover counter-espionage agent.
In his prime, Bart Regan possessed the strength level of a man his age, size, and weight who engaged in intensive regular exercise.
During their partnership, Bart Regan and Sally Norris were engaged to one another. It may be assumed that the two were married following their last published appearances.