Source: comicvine.gamespot.com

1. Symbiote-Bonded

(Earth 1089)

And closing out the list is another What If? Specifically What If? Vol. 2 No. 4 (and no I did not have to look that up because I am a giant nerd with a brain full of useless BS).

In this reality, Peter kinda got busy and put off going to see Mr. Fantastic about his weird new costume that changed shape and seemed to maybe be alive. Because he waited too long, it bonded to him mind and body and ate his life force, aging him quickly as it did. But the symbiote was a fair-weather friend and only used Peter to get it closer to another, more powerful host. That being The Hulk. Oops.

So once the symbiote latched on to the Hulk, Peter, now aged to somewhere in his late nineties, tried frantically to find a way to stop the monster he helped create. He died midway through that experience but had a nice funeral and he tried his best.

And there you have it: quite a few alternate Spider-Men for your reading pleasure. They're all worth your time to go track down the issues and learn more about so maybe have some fun and go back issue hunting some time.