Peggy Mitchell is a fictional character from the BBC soap opera EastEnders. Peggy was initially played by Jo Warne when she first appeared in the episode broadcast on 30 April 1991, featuring in 10 episodes. Peggy was reintroduced in 1994, recast to Barbara Windsor, who made her first appearance in the episode broadcast on 7 November 1994. Peggy became a regular character, and Windsor played the role until she was forced to take a long break due to poor health and departed on 23 May 2003. She returned for two episodes broadcast on 16 and 17 September 2004, before rejoining as a regular character on 8 September 2005. Windsor announced in October 2009 that she would be leaving the show and departed on 10 September 2010. Windsor returned to the show for guest appearances on 20 September 2013, 25 September 2014, 17 February 2015 and 15 January 2016. She then appeared in six episodes between 9 and 17 May 2016, where the character was killed off. Her voice is last heard in the following episode, on 19 May 2016. Peggy's funeral aired on 4 July 2016. An archived recording of her voice was heard on 25 January 2022. On 26 July 2022, it was announced that Peggy would feature in a flashback episode set in 1979, alongside her husband Eric and their children Phil, Grant and Sam. Jaime Winstone played the role of Peggy for this special episode, which aired on 5 September 2022.

Mark Fowler is a fictional character in the BBC soap opera EastEnders. Mark, an original regular character when the series started in February 1985, became a semi-regular after his original portrayer David Scarboro was written out of the role in April 1985. Scarboro made brief returns to the role in 1986 and 1987. Scarboro died by suicide in April 1988 and subsequently Mark was recast two years later on his return, with former Grange Hill regular Todd Carty taking on the role. From this point the character was a permanent fixture in the series and Carty remained in the role until the character was written out of the series in early 2003.