Ah yes, ya gotta love them Treasury-sized crossover books! The first SUPERMAN VS. SPIDERMAN is a classic. Not really a "crossover" but the SUPERMAN VS. WONDER WOMAN one was pretty sweet, too, with Jose-Luis Garcia-Lopez really taking advantage of the larger size for "epic scale" mayhem.

SUPERMAN VS. MUHAMMAD ALI is my favorite Neal Adams comic ever -- wonky as hell, but enjoyably so, and the art is "dyno-mite!"

(And am I the only one who thinks SPACE JAM's similar plotline is just a wee bit too close to be a "coincidence"?)