Zack Sharf Digital News Director “The Flash” director Andy Muschietti recently told IGN that Michael Keaton was overcome with emotions on set when he first stepped into the Batcave, which the production design team created in full on the studio lot. The moment marked Keaton’s first time in the Batcave in nearly 30 years, as “The Flash” is his first time playing Batman/Bruce Wayne since 1992’s “Batman Returns.” “When [Keaton] arrived to the set, the Batcave was already finished and it was lit and everything,” Muschietti said. “He stayed like this [eyes wide] for a while. I didn’t want to interrupt him. I just wanted for him to take it in. Who knows what was going on there? But something was going on there.”