Louis Crandell was the assistant to the scientist Professor Barringer, until a laboratory accident in which he lost his right hand. He then used a prosthetic metal hand to substitute for it. In another laboratory accident, with a new ray, if he received a high voltage electric shock (from power lines, etc.) he would become invisible for a limited period of time, with the exception of his artificial hand.
Crandell initially used his newfound gift to steal, and became a psychot…ic criminal. In early strips he was clearly a villain, but he later decided to use his new powers in crime fighting (it was explained that the accident which made it possible for him to become invisible had temporarily made him insane). He joined a British secret service and espionage agency, known as the Shadow Squad. Armed with his steel claw, which by now was equipped with a variety of weapons and tools in each finger, as well as with his power of invisibility, Louis Crandell battled various criminal geniuses, aliens, and the organisation known as F.E.A.R. (the Federation for Extortion, Assassination and Rebellion).