"Friends for Twenty Years" is the 4773rd episode of the Australian television soap opera Neighbours. The episode was written by Ben Marshall, directed by Jovita O'Shaughnessy, and executively produced by Ric Pellizzeri. It first aired on 27 July 2005 on Network Ten in Australia, as part of the soap's 20th anniversary. Planning for the episode began in March 2004, twelve months before the anniversary. Producers decided to celebrate the 20th anniversary on-screen in July, as winter ratings are usually higher.
Many former Neighbours cast members were invited back for the episode. Producer Peter Dodds said the biggest challenge was getting the returning characters and the anniversary episodes to relate to what was going on in the show at the time, but he believed he had found a good way to combine both the past and the present. "Friends for Twenty Years" was shot in early 2005. Most of the returning actors filmed their scenes at the show's studios in Nunawading, while the others shot their appearance wherever they were based in the world.
The episode centres on Annalise Hartman's (Kimberley Davies) return to Erinsborough to screen her BBC documentary about Ramsay Street and its former residents, some of whom returned to town to view the documentary along with the current residents. More than 6 million viewers tuned in for the episode in the UK, while the critical response for the episode was mixed. Most critics bemoaned Annalise's new career as a film maker, while others were disappointed with the returning characters and thought the episode would only appeal to fans of the show.