Miller's Barry Allen somehow crossed over from his earth to meet Grant Gustin, the Barry Allen of Earth-1. In addition to confirming that the DC films are a part of this multiverse through a surprise cameo from Ezra Miller, it also preserves some of the other shows.
However, Schwartz also revealed that this is not the last we have seen of Amell on Arrow, as "he will be in the series finale" in some capacity, adding that it's now up to Amell and the other shows to decide whether the character should make any future appearances on screen.
Gustin's Barry makes it clear he's a fellow hero and refers to himself as The Flash - a superhero alias Miller's Barry seems to be hearing for the very first time. And more importantly, how did they keep it a secret from all of us? "You guys know my love for DC Comics is endless and hopefully our paths will cross again... if nothing else, we El's have hope". I'm not going to spoil anything because I know many of our readers watch The CW shows after they are released on Netflix.
Brandon Routh, who plays The Atom, commented back to Benoist and said, "I DID NOT KNOW!" Even though the characters from movies like Justice League and Batman v Superman: Dawn of Justice don't exist in the Arrowverse on a day-to-day basis, they are part of that larger multiverse. For now, let's look at how Twitter reacted to the milestone moment.
The CW's epic "Crisis on Infinite Earths" crossover event has been stuffed with fun cameos from across various incarnations of DC Comics' superheroes. He's kidding, of course.
@Noradominick is shocked that Grant and Ezra got to be in a scene together, face to face, after all these years. @Bamsmackpow commemorates this special moment with a well-timed Paul Rudd meme.
I was actually told that Crisis would have something to do with a soft reboot of the DCEU, which Warner Bros. basically mandating the use of Ezra Miller hints at, as it's become known the Erza Miller movie for The Flash will be Flashpoint.
"A massive congratulations and thank you to Marc Guggenheim and all who made Crisis on Infinite Earths happen", Cuffe Tweeted last night. The gif expression on Keegan-Michael Key's face is flawless.