World's Finest Comics #263
In "Final Secret of the Super-Sons," the legendary duo of Superman and Batman observe their sons' adventures as a simulated experiment—until a curious twist sends the boys into the real world. Written by Dennis O'Neil and illustrated by Rich Buckler, with inks by Dick Giordano and colors by Jerry Serpe, this 1980 DC classic reveals the surprising truth behind the Super-Sons' existence. The cover by Ross Andru and Dick Giordano captures the moment of revelation with striking clarity.
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The super-sons' adventures are revealed to be computer simulations observed by Superman and Batman. But when Superman leaves the program running, Superman, Jr. figures out that there is another plane of existence, and the boys enter the real world. There, their presence causes natural disasters, so they sacrifice their artificial lives.
Plot details indexed by the Grand Comics Database (CC BY-SA).