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Kevin Conroy may be new to Batman's live-action adventures, but he's always been considered the definitive version of how the iconic hero should sound. He says his years of voicing Batman has allowed fans to connect with him on a different level than they do with the live-action ones. "When you live in the animated world, you live in people's imaginations. And when you're the voice in their imagination, it's a much more intimate place to be and a much more intimate experience that the audience has with my voice than they do with a live actor's voice," Conroy said. "So, in that sense, I have an advantage over those actors." both "Batman: The Animated Series" and "Batman Beyond" in high definition, and Conroy has enjoyed the crisper look at work he holds dear. "The actor's process, my process, is the same for any approach to [Batman]," Conroy said. "But then to see it visualized in a different way, in a more enhanced way, it just gives more power to the vocal performance. There's more for it to be married to."
Kevin Conroy discussed with Entertainment Weekly how the "Crisis" role took him by surprise, stating how the experience of playing Batman for the first time in live-action "threw him" at first. "I never approached this character from that physicalized aspect. I always just inhabited him with my voice," Conroy said. "When you do that in a recording studio, it's a very intimate experience and you're sort of living in your own imagination. You do it with your eyes closed and you're in this other world, and you have Mark Hamill feeding you [need], and the other actors (because we always recorded together in the booths.)" "To actually be on the set, in the physical world, and to be walking as the character and inhabiting the character in three dimensions, it was a real transition for me," he added. "It did take a while to get used to, I have to admit. I was surprised because I know the character so well."
Executive producer Marc Guggenheim spoke of Kevin Conroy, "He is stupendous, He is Bruce Wayne. [It's] just a lot of fun to see this actor who we all mainly know from voice work being on camera. It was really exciting." Conroy's appearance in "Crisis" is the result of a dream. "One of the things that was always on my bucket list is that I wanted to see old Bruce Wayne," says Guggenheim. "We talked about a variety of different casting possibilities, but [Legends of Tomorrow showrunner] Keto Shimizu, who is a huge animated Batman fan, pointed out that Kevin is the right age. We reached out to Kevin and he couldn't have been more lovely and more game for it."
Sara tells Harbinger that she promised her crew no more crossovers, a breaking the fourth wall joke referring to how the Legends weren't part of the Elseworlds crossover.
Earth-99 is a reference to when Batman Beyond came out in 1999. Kevin Conroy played an older Bruce Wayne (actually much older than this one), who took a new young man under his wing to make sure that there would always be the new Batman of the future.
The Earth-99 Bruce Wayne has mementos/trophies of a bloody Joker card, The Riddler's cane, Mr. Freeze's jar that contained the ice sculpture of his wife Nora Fries, and possibly a plant under glass that may signify Poison Ivy and the glasses of that Earth's Clark Kent.