Casualty is preparing for its 40th anniversary episode with a major on-screen incident planned for Holby City Hospital, according to reporting from multiple outlets. The upcoming installment is described as featuring a “high-stakes major incident,” building on the show’s long-running emergency medicine setting. The previews and announcements indicate the episode will involve heightened danger and heightened tension for staff and patients, with the storyline designed to deliver a dramatic, action-focused sequence as the programme marks 40 years on air. While the specific details of the incident are not provided in the available coverage, both outlets frame the episode as a standout anniversary event, emphasizing that it will be eventful and intense. The reporting also positions the episode as part of the lead-up to the anniversary celebrations, with viewers expected to see significant emergency response activity linked to the major incident at the hospital. Overall, the sources agree on the event’s setting, timing in relation to the 40th anniversary, and the emphasis on a high-risk major incident.