Cover art credits confirmed from Julius Schwartz's editorial records, provided by DC Comics.
This story is a follow-up to "...And So My World Ends!" from Justice League of America (DC, 1960 series) #71. In that story, Mars was devastated and left uninhabitable by war, and the surviving Martians traveled into space to find a new world to call home, followed by J'onn J'onzz. In this story we learn how they ended up on the planet Vonn, and ultimately decide to stay there for their new home. J'onn J'onzz and his fellow Martians are next seen in Justice League of America #115.
Gay Ghost is renamed Grim Ghost as a recognition of the times. Title from the GCD index of Sensation Comics #8.
Letters of comment from Gerard Triano, Bill Henley, Joe Peluso, Bob Rozakis, Mike W. Barr, James Balko, Chuck McLean, Lorin Clark and Gale Acuff.