Casualty@Holby City

Casualty@Holby City
Still from the opening titles of Casualty@Holby City
Genre	Medical drama
Created by	Mervyn Watson Tony McHale
Country of origin	United Kingdom
No. of episodes	9 (list of episodes)
Release
Original network	BBC One
Original release	26 December 2004 – 27 December 2005
Chronology
Related shows	Casualty Holby City

Casualty@Holby City is a series of special crossover episodes of BBC medical dramas Casualty and Holby City. While Casualty was launched on 6 September 1986, and its spin-off Holby City was first aired on 12 January 1999, the first full crossover episode between the two programmes was not broadcast until 26 December 2004. As of 27 December 2005, four crossover specials have been aired, comprising nine episodes total. Although further crossovers of storylines and characters have since occurred, they have not been broadcast under the Casualty@Holby City title.

The suggestion to produce the first Casualty and Holby City crossover originated from a member of the BBC comedy department. The station's Controller of Drama approved of the idea and had the crossover commissioned, spearheaded by Casualty's executive producer Mervyn Watson, and Holby City's Tony McHale. The writer and producer for the first, two-part crossover were selected from the Holby City crew. Logistical difficulties arose from the fact the two series are usually produced 120 miles apart, with Casualty based in Bristol and Holby City in Elstree. Both series are usually in continuous production 52 weeks a year, so in order to produce the first crossover, work on both shows has to be halted for two weeks to release a number of cast members to appear in the special. Once regular production began again, the availability of cast members set to appear in the crossover was limited, and both series had to rely for the most part on the remaining characters who were not in the special. Filming took six weeks to complete, and occurred for the most part at Casualty's emergency department in Bristol. Additional filming took place at the Holby City set in Elstree, as well as the Queen Elizabeth Hospital for Children, a Barratts office block in Brentford and an ex-MOD tank testing site in Chobham. A theme tune was devised, consisting of both the Casualty and Holby City theme tunes played over one another in sync. Terry Ramsey of the Evening Standard described it as "shambolic", opining: "it sounds like it was produced with The Big Boy's Box of Sound Mixing software by a seven-year-old on Christmas Day while playing his PlayStation with the other hand."