Superman & Batman Generations, book 1
John Byrne1999

1939: On the eve of the Metropolis World's Fair, two young heroes meet for the first time: Superman, champion of justice, and the Bat-Man, dark avenger of the night. Together, they must work to defeat the maniacal Ultra-Humanite- no matter what it takes.

1949: Now ten years older and wiser, Superman and Batman face the combined threat of the Joker and Lex Luthor, for the sake of a pregnant Lois Lane- with the aid of Robin, now nearly an adult himself.

A tale of the world's finest heroes and their heirs!