Reign of the Supermen #97: Superbman

Source: What The--!? #2 (1988) and #7 (1990)
Type: PasticheA couple years after he started on Superman, John Byrne returned to Marvel and the Fantastic(al) Four to byrne burn himself in a Mad Magazine manner as Superbman, AKA Park Bench, was manipulated into entering a Marble Comic by Dr. Bloom so that he would (naturally) be forced to fight other heroes.