Rachel Bloom of Crazy Ex-Girlfriend fame wrote a song for the Flash and Supergirl musical crossover.
Darren Criss has been cast as the Music Meister in the Flash/Supergirl musical crossover.
The CW has released details about the upcoming musical crossover between The Flash and Supergirl.
Preview images for the Flash portion of The CW's four-show "Invasion!" crossover.
The CW has released their official description for The Flash's role in the four-part "Invasion!" crossover.
The Flash, Supergirl, Arrow, and DC's Legends of Tomorrow will be teaming up for an Invasion.
It appears that The Flash's crossover episode for Season 3 will be directed by Dermott Downs.
Preview trailer for the Flash and Supergirl crossover episode "Worlds Finest"
CBS has released official photos from the Supergirl episode "Worlds Finest" with Grant Gustin as The Flash.
Grant Gustin is headed to Supergirl in "Worlds Finest!"