Compiling footage from films, video games and TV shows, including footage from Arrow, Flash and the unaired Wonder Woman pilot, the talented Alex Luthor has created every comics fans dream – An epic Marvel vs. DC showdown trailer. It cleverly features many of their respective heroes and some villains and though we realistically will never ever see this happen in the cinematic universe, there is no harm in dreaming…
https://www.youtube.com/watch?v=8KxIHVGch8I#t=200