Screengrab via YouTube Actor and singer Darren Criss is joining the CW Arrowverse, spearheading the much-anticipated musical crossover event as the only villain that you can consider for such a time: Music Meister. Here?s hoping that they get Criss into the outfit too. The CW Arrowverse was ready to turn itself into a mini Glee reunion when it announced it was going to do a musical episode, but Criss?s casting has only added to that.