EastEnders is a British soap opera that has aired on BBC One since 19 February 1985. Several spin-off shows have been made, some of which use the narrative of flashbacks to look at the history of the characters such as "CivvyStreet". Others have been a lead-up for a character's eventual return to the show such as "Return of Nick Cotton", and some have followed characters who had departed from the show in another setting such as the 2016 spin-off series Kat & Alfie: Redwater. With the exception of "CivvyStreet" which was set within Albert Square during the Second World War, these spin-offs take place in a different setting. Documentaries have also aired, particularly for the anniversaries of the show looking back at the history of the show's inception, its characters and storylines.