Arrowverse boss reveals how Crisis on Infinite Earths landed Ezra Miller’s Flash

Marc Guggenheim and his team were able to use the DCEU’s Flash in Crisis on Infinite Earths, and how it came to be may surprise you.

The CW’s Crisis on Infinite Earths event pulled off some major cameos, but the biggest had to be the inclusion of Ezra Miller’s Flash from the DC Extended Universe. As you can imagine, bringing him in was a process, one that Arrowverse producer Marc Guggenheim has now opened up about.

Guggenheim explained to Variety that it was actually Warner Bros. who reached out to him about a potential, crossover opportunity. The TV producer was eager to jump at the chance, even though the episodes were just about done at that point:

"“We were series wrapped on “Arrow,” and we were wrapped on the whole crossover. We were in post and some episodes were locked, and some were soft-locked. I got a phone call from [Warner Bros. boss] Peter Roth saying, ‘I know you’re locked, but can you put Ezra into the crossover?’ And I said, ‘Yes.’ And he said, ‘How, you’re series wrapped? And you’re wrapped on the crossover.’ And I said, ‘Yeah, I know, but if you’re telling me Ezra Miller can be in the crossover, I can make it happen.'”"

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Guggenheim then contacted Eric Wallace — the showrunner of The Flash — to get in touch with Grant Gustin, who was game for the scene Guggenheim wrote, as was Ezra Miller. From there, a crew unit from The Flash was assembled to shoot the sequence:

"“We put together a unit of the “Flash” crew on the “Flash” set [since “Arrow’s” team, which had produced the rest of the hour, was gone]. And much to our surprise, no one noticed Ezra Miller was in Vancouver and no one leaked it from the crew, which we appreciate. So we were able to keep it a surprise.”"

Following the world-merging events of Crisis, it’s unclear if Miller’s Flash still exists in the TV realm, and it’s a question Guggenheim himself isn’t even sure of. “I will leave that question to Warner Bros. and DC,” he said. “They have a wonderful vision for not just Ezra’s Flash, but also the entire DC universe. Jim Lee is the man to talk to.”

Hearing that Warner Bros. suggested adding Miller does come as a bit of a shock. Over the past few years, the Arrowverse and the DCEU have been treated as distinct entities, with the prospect of any kind of crossover seeming impossible. Yet Warner Bros. may have had a specific reason for loaning out the Flash.

Most know the studio is developing a Flashpoint-inspired film from It director Andy Muschietti, and this move could have been a clever way of teasing what’s to come. That film is still a few years away, but it doesn’t hurt to have Miller’s Flash back into the public consciousness well ahead of time.