"Bah Humbug" is the 1019th episode of Casualty and the 15th episode of the 31st series. It was preceded by "All I Want for Christmas is You" and followed by "New Year, New Me, New You". The episode was directed by David Beauchamp and written by Dominique Moloney. The events of the episode take place on 24 December, with the exception of the pre-main intro sequence which picks up directly from the previous episode the day before. Following the episode's transmission, the BBC released Casualty's winter trailer, which featured various upcoming moments of early 2017.