Action Comics (1938) #903 (Variant Edition)

"Reign of the Doomsdays Part 3"

The mastermind behind "Reign of Doomsday" begins the final phase of his plan to destroy Superman and all mankind! Steel, Supergirl, Superboy and the heroes of Earth unite to try to stop the devastation, while Superman undertakes a dangerous journey in a desperate attempt to save the day!

Denys Cowan Incentive Variant Cover

"Reign of the Doomsdays" Tie-in