The twenty-eighth series of Casualty began airing on BBC One on 3 August 2013, one week after the end of the previous series. This series consisted of 48 episodes, the highest episode order since series 24. The series concluded on 23 August 2014.

The twenty-seventh series of Casualty began airing on BBC One on 18 August 2012 with an episode featuring a disaster at a music festival. Filming series 26 was completed in April 2012 and filming series 27 began a week later. The first episode was in the normal format – a 50-minute episode. This season is 44 episodes, increasing from 42 for the previous one. Viewing figures for the first episode were 5.19 million viewers, continuing to be one of the most watched programmes of a Saturday night.