when does the flash show up in supergirl
Supergirl (TV series) On February 3, 2016, it was announced that Grant Gustin, who appears as Barry Allen / Flash on The Flash, would appear in the eighteenth episode of the first season, "Worlds Finest".[113] While no plot details on the episodes were released at the time, Ross A. Lincoln of Deadline.com noted that "the in-universe reason" for the crossover was due to Barry's ability to travel to various dimensions, thus implying that Supergirl exists on an alternate Earth to the Arrowverse in a multiverse.[114] The Flash episode "Welcome to Earth-2" confirmed this, showing an image of Benoist as Supergirl during a sequence where characters travel through that multiverse.[115] The earth that the series inhabits is Earth-38 in the Arrowverse multiverse,[116] and has been informally referred to as "Earth-CBS" by Marc Guggenheim, one of the creators of Arrow.[117]
The Flash (2014 TV series) The Flash premiered in North America on October 7, 2014, where the pilot became the second-most watched premiere in the history of The CW, after The Vampire Diaries in 2009. It has been well received by critics and audiences, and won the People's Choice Award for "Favorite New TV Drama" in 2014. The series, together with Arrow, has spun characters out to their own show, Legends of Tomorrow, which premiered on January 21, 2016. On January 8, 2017, The CW renewed the show for a fourth season,[1] which is scheduled to debut on October 10, 2017.[2]