Published in cooperation with the National Social Welfare Assembly.
Later appears in DC comics cover-dated June 1966.
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
Letters submitted by Joseph Farrell; Don Stanwood; Robert Malisani; Jeff Sosnaud
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
Series continued from Mystery in Space (DC, 1951 series).