ARROW CELEBRATES 100 EPISODES; THE EPIC SUPERHERO CROSSOVER CONTINUES — Oliver and the recruits take on a new threat with help from The Flash (guest star Grant Gustin) and Supergirl (guest star Melissa Benoist).
The epic superhero crossover kicks off tonight when Barry Allen (guest star Grant Gustin) and Cisco Ramon (guest star Carlos Valdes) seek Kara’s help with an alien invasion on their Earth.
The DC TV crossover kicks off with Supergirl ‘Medusa’ Monday November 28 at 8pm on The CW, continuing with The Flash ‘Invasion!’
More recently, both shows worked to establish another spinoff in the form of time-traveling superhero adventure series Legends of Tomorrow.