Earlier today, artist Mushk Rizvi uploaded concept art for several past and upcoming MCU projects to her website...including Avengers: Doomsday. It was a pretty major blunder, albeit one that's unlikely to do any harm to the movie. If anything, it will just increase excitement.

Regardless, Rizvi also shared some of her work on Captain America: Brave New World, showcasing the superpowered Serpent Society.

Original plans called for this team to battle Cap, The Falcon, and possibly even Isaiah Bradley during the movie's opening. Rumour has it the previous iteration of The Leader - think more mastermind and less victim - enhanced the villains who were a crucial part of his plan to steal Adamantium and cause a global crisis.

There are several alternate designs here and, based on set photos, Marvel Studios initially went for those full-blown supervillain costumes. The one thing this lot has in common are cybernetic...