Rachel Bloom of Crazy Ex-Girlfriend fame wrote a song for the Flash and Supergirl musical crossover.
Official CW preview images for the Flash episode "Dead or Alive"
Overnight ratings report for the Flash episode "Borrowing Problems From The Future"
Screen captures from the preview trailer for the Arrow episode "Dead or Alive"
Preview trailer for the Flash episode "Dead or Alive"
Preview clip for the Flash episode "Borrowing Problems From The Future" and recap of the season so far
Darren Criss has been cast as the Music Meister in the Flash/Supergirl musical crossover.
Official CW description for the Flash episode "Untouchable"
The CW has released details about the upcoming musical crossover between The Flash and Supergirl.
Extended promo trailer for The Flash episode "Borrowing Problems From The Future"