The British comedian and actor popped up in the latest trailer, which was unveiled at CinemaCon in Las Vegas on Tuesday. Details about his character remain under wraps, however, Coogan appears to play an authority figure with an American accent. In the clip, he asks Joaquin Phoenix's character Arthur Fleck/Joker, "Tell us, what's changed, Arthur?" Arthur replies, "I'll tell you what's changed - I'm not alone anymore." Joker: Folie à Deux, the sequel to 2019's Joker, follows Phoenix's Arthur as he meets his love interest Harley Quinn, played by Lady Gaga,...