Actions Comics Vol. 1 #1 (1938) (2017 reprint)

First appearance of Superman

Flash Vol. 2 #123 (1961)

(2020 reprint)

First appearance of Earth-Two

Flash Vol. 1 #129 (1962)

First Silver Age appearance of the Justice Society of America

Shazam #1 (1973)

Return of Captain Marvel

Superman Vol. 1 #423 (1986)

Whatever Happened to the Man of Tomorrow? Part 1

Action Comics Vol. 1 #583 (1986)

Whatever Happened to the Man of Tomorrow? Part 2

The Flash Vol. 2 #1 (1987)

Wally West takes over as the Flash

Batman Vol. 1 #497 (1993)

Bane breaks the Batman