Conclusion of serial. Last Golden Age appearance of Mr. Mind and Herkimer; both next appear in Shazam! #2; Mr. Mind's survival explained in Shazam! #31.
Inker revision from Beck to Beck-Costanza Studio per P. C. Hamerlinck, added by Craig Delich.
The studio included C. C. Beck, Pete Costanza, Jack Binder (who worked for Beck until he started working on the Mary Marvel stories), and Mac Raboy.
Ed Robbins, also a part of the studio, and who often laid out the stories for the other artists to follow, was not involved in this story.