Real Name: Prof. Carl Kruger
Occupation: Criminal
Marital Status: Unknown
Base of Operations: Gotham
Height: Unknown
Weight: Unknown
Eyes: Unknown
Hair: Unknown
First Appearance: Dectective Comics #33 (November 1939)
Created By: Bill Finger

Four renegade scientists, Led by Prof. Carl Kruger, have a scarlet dirigible with a "death ray machine" through the successful "fusion of ozene gas and gama ray" which can topple buildings.