CasualtyXHolby

"CasualtyXHolby" is a two-part crossover of the British medical dramas Casualty and Holby City. The first part aired on 2 March 2019, and the second on 5 March 2019 on BBC One. Both episodes were written by Michelle Lipton and directed by Steve Brett. The plot sees Holby City Hospital experience a loss of power due to a cyberattack. Consultants Connie Beauchamp (Amanda Mealing) and Jac Naylor (Rosie Marcel) also come into conflict when they learn there is only one theatre available while treating two of their colleagues.

The episodes mark the first time that the two shows have crossed over since 2005, and are part of a year-long celebration for Holby City's 20th anniversary. The crossover was first pitched to BBC One in 2017 and early drafts had various vehicles striking an electrical substation to cause the blackout, before the teams settled on a cyberattack. The crossover allows characters from both shows to interact with one another, as they react to the cyberattack and the effect it has on the hospital. It also shows how reliant the hospital is on technology.

"CasualtyXHolby" was filmed in late 2018 at the Roath Lock studios and BBC Elstree Centre. Crew from both shows worked together across the two sets. Harper found organising the filming schedule to be the hardest part of creating the episodes. The production design team created two sets especially for scenes in which Ric Griffin (Hugh Quarshie) has to crawl through the hospital's ventilation system.

The crossover was promoted with a series of trailers and cast member appearances on talk shows. "CasualtyXHolby" received a positive response from television critics. Victoria Wilson of TVTimes stated that it was "a gripping crossover with a fitting ending", while Sue Haasler for the Metro thought the cyberattack was a good plot device, which led to a "toe-curlingly good" clash between Connie and Jac. The crossover was nominated for Best Drama Storyline at the 2019 Inside Soap Awards.