Casualty series 18

The eighteenth series of the British medical drama television series Casualty began airing on BBC One in the United Kingdom on 13 September 2003, and concluded on 28 August 2004. The series consists of 46 episodes, which focus on the professional and personal lives of medical and ancillary staff at the emergency department (ED) of the fictional Holby City Hospital. Foz Allen serves as the series producer, while Mal Young and Mervyn Watson act as the executive producers of the series. Twelve regular cast members reprised their roles from the previous series and six actors joined the cast during the series. Original cast member Julia Watson, who portrays Baz Wilder, also returned.

The series begins with a two-part episode airing over consecutive days, and features a double train crash. The stunt was filmed at Nene Valley Railway over 24 days and involved two production teams and 1470 supporting artists. A story was also created to raise money for 24th Children in Need telethon, in November 2003, and features a cameo appearance from Lord Lichfield. Series 18 of Casualty marks the show becoming the longest running television medical drama series in the world. The serial was nominated for Best Continuing Drama at the 2004 British Academy Television Awards during the series. In a 2011 poll run by the show's website, to celebrate its twenty-fifth anniversary, the opening episode of the series was voted the best ever episode.