Doomsday! (Superman #75)
For those too young to remember, “The Death of Superman” was a huge storyline with major mainstream news coverage and it was possibly the first storyline where the main character actually died. Sure, characters died, you lost Uncle Ben, Gwen Stacy and Bucky but you never lost Spider-Man, Captain America and certainly not Superman, the greatest hero of them all!
Monsters, Mutations and Mayhem! (untold tales of spider-man #9)
This book takes place in the early days of Spider-Man’s career, but unlike Ultimate Spider-Man, this took place in the 616-universe, the main Marvel Universe. There are references to the original Stan Lee/Steve Ditko books but I don’t remember feeling like I had to find 35-year-old comics to follow them.