Spider-Verse is a currently running event in the Spider-Man comics that will involve every* Spider-Man we've ever met, including several Spider-Women and Spider-Girls (not to mention Scarlet Spiders and Spider-Hams and whatnot), and several brand-new versions. The premise is simple: there's a group of people trying to wipe out every Spider character across the multiverse, so all the Spider characters will team up to stop them. This is, of course, a massive event - multimedia even, since it will also feature in the Spider-Man Unlimited video game and the animated series Ultimate Spider-Man - and given the premise, it's only natural that it will add a few entries to this catalog.
*I say "every" because Marvel says "every", but there are a few that won't be showing up, such as Tobey Maguire and Andrew Garfield.
The first such entry is Spider-Man Unlimited.
Spider-Man Unlimited was a 1999 follow-up to Spider-Man: The Animated Series that was only loosely connected at best. In the show, Spider-Man finds himself on Counter-Earth, which has been taken over by the High Evolutionary and his Beastials. Spider-Man decides to take down the High Evolutionary, and to that end joins the rebellion, which includes a heroic Green Goblin and Vulture. It wasn't a very good show and only lasted 13 episodes.
This Spider-Man, as well as High Evolutionary lackey Lord Tyger (and several unnamed Beastials) appeared in Amazing Spider-Man #7 (October 2014) as some of Morlun's latest defeats. Unfortunately, in an event such as this, you need people to die in order to raise the stakes and also clear the playing field. On the other hand, if there were any characters you could kill without raising a fuss, it'd be these.
(Note: This Spider-Man costume previously appeared in my Marvel Appearances Super Post.)