Doc Hump was originally summoned by Larceny Lu to treat Steve the Tramp but was subdued and bound by Scotty Bumpstead who took his place. Lu recognized Scotty and captured him and gave him to Doc Hump. Doc Hump was about to experiment on Scotty when one of Lu’s men unwittingly lit Scotty’s cigar/smoke bomb, leading to the two men being arrested. Later, Doc Hump was freed from jail and he went to his family mansion. He injected dogs with rabies and planned to kill Dick Tracy with them. Doc planned to test them on his butler, but Tracy showed up in time and rescued the servant.