For inspiration for the crowd scenes in the film, the production staff referenced a poster featuring more than 320 "Simpsons" characters. Groening said they tried to include every single character in the film, with 98 having speaking parts, and most members of the crowds being previously established characters instead of generic people. The series' regular voice actors: Dan Castellaneta, Julie Kavner, Nancy Cartwright, Yeardley Smith, Hank Azaria and Harry Shearer, as well as semi-regular performers Tress MacNeille, Pamela Hayden, Marcia Wallace, Maggie Roswell, Russi Taylor and Karl Wiedergott, reprised their roles. Joe Mantegna returned as Fat Tony, while Albert Brooks, who supplied many guest voices in episodes, was cast as the main antagonist Russ Cargill after he told the staff that he wanted to be part of the film. For "about a week", he was to reprise the role of Hank Scorpio, but when the character was omitted from the film, he ended up voicing Cargill himself.