"Charlie's Anniversary" is the 592nd episode of Casualty and the 2nd episode of the 22nd series. It features another guest appearance of Amanda Mealing as Connie Beauchamp from Holby City, who later went on to join the main cast of Casualty in 2014 following her departure from Holby City in 2010.
The events of this episode take place on 8 September, as they follow the same events as the previous episode. The first episode of the series focuses on Toby's day, whereas the second focuses on Charlie's.
The aftermath of the explosion is seen from Charlie's perspective as he struggles to stop the body count rising even further. When the veteran nurse makes a simple mistake it is left to Connie Beauchamp to take charge and whip the overstretched team into shape. To make matters worse, the Emergency Department is then evacuated due to an unattended bag.