where was it aired?
On The CW
Flash vs. Arrow
on The CW.
when does the flash show up in arrow December 2, 2014 is this a film? It is an Arrowverse crossover event what do you mean by this first term you used in your answer? The Arrowverse is an American media franchise and a shared universe that is centered on various interconnected television series when was it launched? October 2012 can you name any two of such tv series? "The Flash", "Legends of Tomorrow", "Supergirl" does it also support audio series? Audio studio Serial Box is currently developing an audio series for it who developed the above crossover event we talked about? UNANSWERABLE
wiki:14838343
Flash vs. Arrow [SEP] Broadcast
The "Flash vs. Arrow" crossover episodes were shown at an exclusive fan screening at the Crest Theatre in Westwood, Los Angeles on November 22, 2014. Afterwards, Amell, Gustin, David Ramsey, Emily Bett Rickards, Danielle Panabaker and Carlos Valdes were joined by executive producers Berlanti, Kreisberg and Guggenheim for a Q&A panel. The first part of the crossover, "The Flash", was broadcast on December 2, 2014, followed by part two on "Arrow" on December 3, both on The CW. The crossover was simulcast with the US broadcast in Canada on CTV. It first aired in the United Kingdom on Channel 5 on December 16 and December 18, 2014.