CW superhero series, The Flash, "easier to facilitate" as the series also films in Vancouver. Filming for the season began in July 2016, and ended in April 2017. Music The score for the season was composed by Blake Neely. Arrowverse tie-ins The episode "Medusa" ends with a scene where Barry Allen and Cisco Ramon of Earth-1 arrive at Kara's loft enlisting her help with a problem on their Earth, thereby setting up the Arrowverse crossover event "Invasion!" that begins on The Flash season 3 episode 8, continues on Arrow season 5 episode 8 and concludes on Legends of Tomorrow season 2 episode 7. This scene is later repeated in the Flash episode of the crossover. Kara/Supergirl appears in all three episodes as a visitor to their universe due to Supergirl being set in a different Earth, referred to as Earth-38 by the inhabitants of the Arrowverse, and has been informally referred to as "Earth-CBS" by Arrow showrunner Marc Guggenheim, named for the network where Supergirl first aired. Similarly, the episode "Star-Crossed" ends with Music Meister hypnotizing Kara and fleeing to Earth-1 to do the same to Barry, thus initiating the events of The Flash season 3 episode "Duet". Release Broadcast The season began airing on The CW on October 10, 2016, in the United States, and ended on May 22, 2017. It premiered on the same day as the United States in Canada on Showcase, and on October 24, 2016, in the United Kingdom on Sky One. Home media The season was released on DVD in Region 2 on August 21, 2017, on DVD and Blu-ray in Region 1 on August 22, and DVD Region 3 on August 23. Reception Ratings Critical response The review aggregator website Rotten Tomatoes gave the second season a 92% approval rating from critics with an average rating of 7.91/10, based on 19 reviews. The site's consensus reads, "The arrival of the more famous cousin in Supergirl does nothing to detract from the show's lead, who continues to deliver strength, action, and relatability." Metacritic, which uses a weighted average, assigned a score of 81 out of 100 based on 4 reviews, indicating "universal acclaim". Jesse Schedeen of IGN rated the season 7.3 out of 10, giving the verdict, "In many ways, Supergirl improved in its second season as the show moved to The CW and bolstered its already solid cast with several new favorites. This