This new clip, from the upcoming CW Superhero crossover, reveals how Arrow and the heroes of Legends Of Tomorrow react to Supergirl, for the first time. As the heroes stand together to fight a technologically advanced alien race, they are going to need as many heroes as possible. Flash obviously know someone, who could be of great help. Watch the clip by clicking on the video above.

DC's Legends of Tomorrow --"Invasion"-- Image LGN207c_0277.jpg -- Pictured (L-R): Stephen Amell as Oliver Queen, Grant Gustin as Barry Allen, Brandon Routh as Ray Palmer/Atom and Melissa Benoist as Kara/Supergirl -- Photo: Diyah Pera/The CW -- © 2016 The CW Network, LLC. All Rights Reserved

When the alien race known as the Dominators attack Central City, Barry Allen seeks the help of Oliver Queen to stop them. They quickly realize the threat is bigger than they can both handle, and set out to find the Legends of Tomorrow, as well as recruiting Kara Danvers from her Earth. With all the heroes assembled, a plan is made to defeat the Dominators, only to be sidetracked when a secret related to Flashpoint is revealed, forcing the team to doubt who they can trust. Martin Stein, with help from others, is eventually able to find a way to defeat the Dominators. Additionally, Oliver wakes up to a life where he never got on The Queen’s Gambit, with his parents, Robert and Moira, alive, and Laurel Lance his fiancée. However, Oliver begins to notice imperfections in this new reality that makes him question it. Meanwhile, Stein becomes distracted by an aberration he created in 1987 (source: wikipedia)

legends-tomorrow-invasion-preview-images

CW Superhero Crossover’s first part on The Flash will air on November 29, followed by part two on Arrow on November 30, and concluding with part three on Legends of Tomorrow on December 1, all on The CW