Please note this is a region 2 DVD and will require a region 2 or region free DVD player in order to playThree-episode crossover event featuring DC superheroes from \'Arrow\' \'The Flash\' \'Supergirl\' and \'DC\'s Legends of Tomorrow\' When Barry Allen aka The Flash (Grant Gustin) investigates a meteor that\'s crashed outside Central City he discovers a race of aliens called the Dominators whose spaceship has crash-landed on Earth To combat the threat of the alien race Barry and his team at STAR Labs join forces with Team Arrow Supergirl (Melissa Benoist) and the Legends of Tomorrow to save the planet from the extraterrestrial threatActors Grant Gustin Candice Patton Danielle Panabaker Carlos Valdes Keiynan LonsdaleWriters Greg Berlanti Andrew Kreisberg Aaron Helbing Marc Guggenheim Wendy MericleFormat PALSubtitles EnglishSubtitles For The Hearing Impaired EnglishRegion Region 2 (This DVD may not be viewable outside Europe Read more about DVD formats)Aspect Ratio 169 - 1781Number of discs 1