The 2nd major crossover for "Arrow" and "The Flash" will feature nine superheroes, and also launch the anticipated spin-off "DC’s "Legends of Tomorrow." "In its second major crossover event with ...

It's hero vs hero in the two night epic event as Oliver and Barry collide. Its good news for all 'Arrow' and 'Flash' fans as the two superheroes will get to work together in epic crossover episodes.