No cover image.
DC Comics
The Unknown X
Jun 1941
Jerry Siegel Jack Lehti John B. Wentworth Henry Boltinoff Gardner Fox Ed Moore Bill Finger
Paul Cassidy Harry Lampert Jack Lehti Stan Aschmeier Henry Boltinoff Joseph Sulman Ed Moore Bob Kane
Leo Nowak Harry Lampert Jack Lehti Stan Aschmeier Henry Boltinoff Joseph Sulman Ed Moore Bob Kane
Fred Ray