House ad for DC 100-Page Super Spectacular #6 (1971); printed in Detective Comics #471 (September 1971)
Ad designed and lettered by Gaspar Saladino
Here, take a better look at this book's beautiful wrap-around cover!
(Click picture to Earth-2-size)
Can you name all the heroes above and their various origin Earths? Why, you don't have to...DC did it for ya!: