Across 24 pages in three parts with each part ending in a 2/3 page. This is the only appearance or mention of the Challengers Corps.
On the bottom of page 7 of the main story sequence.
On the page immediately following page 10 of the main story sequence.
On the page immediately preceding page 11 of the main story sequence.
On the page immediately following page 16 of the main story sequence.
Letters from Chuck Robinson, Charles Pekar, and Annemarie Berrard plus plug for Voice of Comicdom (fanzine by Marvin Wolfman).