The Flash Season 3: 8 New Villains You Need To Know About
4. Music Meister
As far as upcoming episodes of The CW superhero shows go, few are as exciting as the musical crossover between The Flash and Supergirl. Although the idea may not be to everyone's taste, it should be a really fun watch, allowing many of the cast members to unleash their considerable vocal talents (you don't cast Glee alum and Broadway stars and not let them sing).
While there's no official word on who the villain of that episode will be, there are rumours, and they point to one rather obvious choice: Music Meister. The character, who appeared in an episode of Batman: The Brave and The Bold, has the ability to make people sing and dance, which makes him pretty perfect for the episode, and there aren't many more obvious contenders for who it could be. (And hopefully, if this does happen, they can bring Neil Patrick Harris in to play him.)