Prior to the revelation that Vulture would be the likely villain featured in Spider-Man: Homecoming, there were very persistent rumors that Kraven the Hunter, another classic Spidey villain who also happens to be one of the original members of the Sinister Six was going to be the main bad guy in the first MCU Spider-Man film.
The group first appeared in The Amazing Spider-Man Annual #1 in 1964 and the group was headlined by Doctor Octopus.
For those that may not be as familiar with their Spider-Man history, The Sinister Six is essentially an Avengers style band of supervillains who team together to try and take down Spidey.
Though it is very early on, it looks like Marvel Studios may be laying the seeds for something much bigger to come with Spidey’s arc in the Marvel Cinematic Universe, and that thing could be The Sinister Six.