than 425 actresses that also included Bruna Marquezine. All auditions for the role, as well as chemistry tests with Miller, took place over Zoom. In March 2021, Clemons signed a new deal to star as Iris West in the film after her role in Justice League was cut (though the cameo was restored in the 2021 director's cut Zack Snyder's Justice League). Maribel Verdú was cast to portray Barry Allen's mother Nora Allen, but Crudup was forced to drop out of the film due to scheduling conflicts with his series The Morning Show. The role of Henry Allen was expected to be recast. At the end of March, Keaton said he had received an older version of the script but had not yet read it, and would have to read the latest draft before deciding if he could commit to the film. He also cited the COVID-19 pandemic in the United Kingdom as a concern for his involvement, as well as balancing his other commitments. Shortly after, Ron Livingston was cast to replace Crudup as Henry Allen, with Ian Loh cast as a young Barry Allen, and Saoirse-Monica Jackson and Rudy Mancuso joining in undisclosed roles. Before filming began, Keaton was confirmed to be starring in the film, with Andy Muschietti believing Keaton's decision to join The Flash was due to the script that he had been sent. Muschietti said Keaton felt honored to play Batman again. The Muschiettis formed a production company, Double Dream, to co-produce the film, and Marianne Jenkins was revealed as an executive producer. Fisher said it would be a "bummer" if the situation surrounding his involvement in the film was not resolved, and said he would return to the role of Cyborg for the film if Warner Bros. were to make amends with him. Filming Principal photography began on April 19, 2021, at Warner Bros. Studios, Leavesden, in England, under the working title Baby Shower. Henry Braham served as cinematographer after previously working on DC's The Suicide Squad (2021). In early May, filming took place at Burghley House in Stamford, Lincolnshire, which doubled for Wayne Manor. In mid-June, Miller, Clemons, Keaton, and Calle filmed scenes at St Paul's Cathedral in London, with the surrounding locations designed to portray Central City. Filming was also set to occur later that month in Edinburgh and Glasgow—doubling for Gotham City—for scenes with Affleck and Keaton. In late July, filming