Television News 'Arrow,' 'The Flash,' 'Legends of Tomorrow,' 'Supergirl' crossover announced by The CW 05/19/2016 The CW announced that its four DC Comics superhero shows will come together for a special crossover episode in December. Read More RELATED NEWS Jimmy Fallon's 'The Tonight Show' dropping to only four nights a weekAshley Tisdale announces birth of her second childSelena Gomez is a billionaire TAGS: Mark Pedowitz Greg Berlanti Arrow The Flash The Flash Legends of Tomorrow Supergirl