In his new film Birdman, Michael Keaton plays an aging actor living in the shadow of a past superhero role. It would be easy to see this as Keaton’s swan song to Batman, a character he re-invented for the big screen in Tim Burton’s Batman and Batman Returns. But Keaton says that’s not the case. In fact, he’d be willing to play Batman again – under one condition. “If it was Tim Burton directing? In a heartbeat,” Keaton tells Entertainment Weekly in a new cover story.