Best Cover You've Never Seen--Superman Family #187 (1978)

Here's a question you don't get every day:

The answer is, "No, the world will NOT be destroyed when TWO SUPERMEN merge into a GIANT SUPERMAN." In fact, there were "miliseconds [sic] to spare" before two universes blew up!

Bonus: The Jimmy Olsen of Earth-2 got an organ transplant from the Jimmy Olsen of Earth-1. Considering Jimmy-1 had just been using the Elastic Man formula, that probably had some interesting results...

That is, by the way, Jose Luis Garcia-Lopez drawing (and inking) the living hell out of that cover.