Casualty (stylised as CASUAL+Y) is a British medical drama series that airs weekly on BBC One. It is the longest-running emergency medical drama television series in the world, and the most enduring medical drama shown on prime time television in the world. Created by Jeremy Brock and Paul Unwin, it was first broadcast in the United Kingdom on BBC One on 6 September 1986. The original producer was Geraint Morris.The programme is set in the fictional Holby City Hospital and focuses on the staff and patients of the hospital's Accident and Emergency (A&E) Department. The show has strong ties to its sister programme Holby City, which began as a spin-off series from Casualty in 1999, set in the same hospital. Casualty is shown weekly on a Saturday evening, which has been its time slot since the early 1990s.
Casualty's exterior shots were mainly filmed outside the Ashley Down Centre in Bristol from 1986 until 2002, when they moved to the centre of Bristol. In 2011, Casualty celebrated its 25th anniversary and moved production to the Roath Lock Studios in Cardiff, where it is currently filmed. The 1,000th episode of Casualty aired on 25 June 2016. A feature-length 30th anniversary episode of Casualty aired on 27 August 2016, episode 1 of series 31. For the series 31 finale, creator Paul Unwin returned to write a special episode which was entirely recorded in one take using only one camera, five boom operators and forty microphones. On 17 March 2020, production on the series was postponed due to the COVID-19 pandemic along with all other BBC shows; filming resumed in September 2020. When Casualty returns, it will have a shorter duration time of 40 minutes rather than its usual 50 minutes. It was later confirmed that Casualty would return on 2 January 2021.