John Barrowman Gives A Sneak Peek of a Special Episode of “The Flash”!

A special episode of The Flash will air tomorrow night, and The CW has released a video of actor John Barrowman giving a sneak peek of the episode. The episode will be a musical crossover between The Flash and Supergirl.

Check out the video below and make sure to check out The Flash Tuesdays on The CW!