One of the many ways fans judge a superhero is by their rogues gallery. Batman is a fascinating guy, but he wouldn't be nearly as popular without his many enemies. Spider-Man has one of the best casts of costumed criminals in the business. While a few of his notable nemeses have taken to the screen, he still has a lot of foes that never appeared on film. One strange example is Mac Gargan, who briefly appeared in Spider-Man: Homecoming but still hasn't taken on the Scorpion mantle.