Frank Craben was a Nazi spy who was active during World War II. By the fall of 1943 he had infiltrated an anti-Nazi resistance located in Frankfurt, Germany and spied on their operations. When the group began working with the Destroyer, using luminescent paint hidden in wine barrels in order to paint the roofs of Nazi defense buildings, Craben exposed the resistance fighters, leading to their capture.
The Destroyer came to their rescue, knocking Craben out and gunning down his men. The Destroyer and the resistance fighters then fled the scene as Allied bombers blew up the area. It is unknown if Craben was killed in the explosions or managed to survive.