text: In October 2009, a 12-part Internet spin-off series entitled EastEnders: E20 was announced. The series was conceived by executive producer Diederick Santer "as a way of nurturing new, young talent, both on- and off-screen, and exploring the stories of the soaps' anonymous bystanders." E20 features a group of sixth-form characters and targets the "Hollyoaks demographic". It was written by a team of young writers and was shown three times a week on the EastEnders website from 8 January 2010. A second 10-part series started in September 2010, with twice-weekly episodes available online and an omnibus on BBC Three. A third series of 15 episodes started in September 2011.EastEnders and rival soap opera Coronation Street took part in a crossover episode for Children in Need on 19 November 2010 called "East Street". On 4 April 2015, EastEnders confirmed plans for a BBC One series featuring Kat and Alfie Moon. The six-part drama, Kat & Alfie: Redwater, was created by executive producer Dominic Treadwell-Collins and his team. In the spin-off, the Moons visit Ireland where they "search for answers to some very big questions".
  Until its closure, BBC Store released 553 EastEnders episodes from various years, including the special episode "CivvyStreet", available to buy as digital downloads.