DCU Heroes Secret Files #1 pg 60

Nice splash with Chronos, Superman, Starman, Flash (John Fox), Arsenal, and Star-Spangled Kid. I believe this art was also used for the title page.
Actually, if you are into the whole birth page thing, this page is the first appearance of Stargirl a full five months before Stars and STRIPE #0. In this comic, she was also in a Who's Who character profile and a Courtney's yearbook page. More of a preview than a story but it was first.