Darkseid vs Galactus, Silver Surfer vs Orion - the Jack Kirby Super Fight by John Byrne! 

The best part is the Joker and the Red Skull simultaneously trying (and failing) to poison each other...

Wish he got to do a FF and Superman crossover

That was me. It wasn't a pitch. I wrote the story for Byrne when I was twelve in 1984 and was planning on presenting it to him at a convention later that year. Unfortunately, I got grounded at the last minute and wasn't able to attend. When I finally met him in 1994, I told him I had written him an epic story ten years earlier but couldn't make it to the convention. He asked me what the epic story was about? And I broke down the basic outline. I finished with "basically, Galactus tries to eat Apokalypse." He complimented the idea (as did Perez) and having been validated by two legends, I continued on my merry way. A few months later Byrne put a letter in Next Men announcing that his plan to do a Darkseid vs Galactus comic based on a an idea he got from a fan. He wanted to give me credit for the concept but didn't know my name, or how to contact me? When I finally got in touch with Byrne, he told me that George Perez convinced him to do the book on their way back from the convention. So big up to the late master, George Perez. As an aside, when I met them, I got the impression that Perez liked the idea more than Byrne. Still, I never thought it would be greenlit by both companies. Event projects rarely feature two villains as the lead characters.

A well-worn comic is a loved comic.

@@raphaelcurley Yes! Well said.