Following Spider-Man 3, Sam Raimi was planning on doing a fourth Spider-Man movie that was to feature the Vulture, Mysterio and Felicia Hardy (Black Cat).
If you previously haven't seen them, storyboard artist Jeffrey Henderson posted a batch of Spider-Man 4 storyboards (via reddit).
We see Mysterio looks a lot like Bruce Campbell (Raimi's long time Evil Dead friend and who has cameoed on Raimi's Spider-Man movies), and Felicia Hady looks like Angelina Jolie, though reportedly Anne Hathaway was going to play the character.
Alas, Spider-Man 4 never happened, Raimi went on to do Drag Me To Hell and Oz the Great and Powerful, and eventually Spider-Man was rebooted with Amazing Spider-Man.
Now Vulture is rumored for the latest Spider-Man reboot, Spider-Man: Homecoming, possibly played by Michael Keaton.
Check out the full Spider-Man 4 storyboards at Henderson's site.