Alfred's line in The Batman about his «days in the circus» might not carry the same meaning that many initially believed, but it could still prove a link to the Graysons and set up an origin story for Robin to appear in The Batman's sequel. The Batman introduces a gothic Gotham City that combines some of the vigilante's most iconic elements into a grounded and brutal iteration that quickly won over both critics and audiences alike. Its take on both Batman/Bruce Wayne and the Riddler has seen the film garner much praise, especially regarding the cast of Batman's allies and adversaries, many of which were reimagined to match Reeves' vision.
A significant shift towards realism sees The Batman's Gotham City reimagined somewhat for Robert Pattinson's Batman, and many of his supporting characters have had similar overhauls. Paul Dano's Riddler is the most obvious example, but there's also Andy Serkis' Alfred — Bruce Wayne's butler and former guardian. Serkis' Alfred acts in many ways as a sidekick to Pattinson's Batman, helping him to crack the Riddler's ciphers in a moment that sees him reference his time in «the circus».
Related: No, The Batman's Alfred Didn't Work With Robin's Parents In The Circus
Some took this to be a reference to the Flying Graysons, the circus act which features a young Dick Grayson (AKA the first Robin). However, it's actually a reference to the works of John Le Carré, a spy novelist, and it confirms Alfred's backstory for The Batman, as «The Circus» is Le Carré's nickname for MI6, the British secret service. This seemingly debunks the theory that it could link Alfred to The Batman's Graysons, but there is a way that it could perfectly set up Robin to appear in a sequel.
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