<P> `` Flash vs. Arrow '' is the first annual Arrowverse crossover event , broadcast on The CW , featuring episodes of the Arrowverse television series The Flash and Arrow . The event began on December 2 , 2014 , with The Flash episode `` Flash vs. Arrow '' and concluded the next day with the Arrow episode `` The Brave and The Bold '' . The crossover sees Team Flash ( Barry Allen / Flash , Caitlin Snow , and Cisco Ramon ) helping Team Arrow ( Oliver Queen / Arrow , Felicity Smoak , and John Diggle ) take on the boomerang - wielding villain Captain Boomerang , while Team Arrow helps Team Flash confront the metahuman Roy Bivolo . </P>
<P> `` Flash vs. Arrow '' is the first annual Arrowverse crossover event , broadcast on The CW , featuring episodes of the Arrowverse television series The Flash and Arrow . The event began on December 2 , 2014 , with The Flash episode `` Flash vs. Arrow '' and concluded the next day with the Arrow episode `` The Brave and The Bold '' . The crossover sees Team Flash ( Barry Allen / Flash , Caitlin Snow , and Cisco Ramon ) helping Team Arrow ( Oliver Queen / Arrow , Felicity Smoak , and John Diggle ) take on the boomerang - wielding villain Captain Boomerang , while Team Arrow helps Team Flash confront the metahuman Roy Bivolo . </P>
when do the arrow and the flash crossover
when do the arrow and the flash crossover
December 2 , 2014
December 2 , 2014