When Christopher Nolan initially approached Sir Michael Caine to play Alfred Pennyworth in Batman Begins (2005), Caine was actually highly skeptical. He joked to Nolan that he was far too old to play Batman and asked, “Do you want me to play the butler? What would my dialogues be? ‘Would you like another beverage or more custard?’” To avoid playing a cliché, passive servant, Caine invented an incredibly thorough and specific military backstory for Alfred: Caine decided that Alfred was not a traditionally trained butler who went to service school. Instead, he imagined him as a former Special Air Service (SAS) soldier who had been severely wounded in battle and could no longer fight on the front lines. Because this tough sergeant didn't want to return to civilian life, he took over managing the Sergeants' Mess. Caine explained, “So what that is is you have this very tough ex-S.A.S. guy who knows all about drinks and service and getting sandwiches and coffee, because he had to learn it for the sergeants mess.” In Caine’s backstory, Thomas Wayne visited the SAS headquarters in Herefordshire to see an officer friend. While in the mess, he met this fiercely disciplined, highly capable sergeant and hired him right there to be his personal keeper and protector. When Caine pitched this entire character outline to Christopher Nolan on set, the director absolutely loved it. Nolan looked at him and said, “Oh, I should have written it.” This exact backstory Michael Caine invented was so popular and rich that DC Comics later leaned heavily into Alfred's active military history, and it eventually became the primary foundation for the standalone prequel TV series Pennyworth on Epix.