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Casualty@Holby City (styled as CASUAL + Y @ HOLBY CI + Y) 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. Wikipedia