A two-part crossover episode with "Holby City" was developed for the beginning of the show's second series, broadcast in 2008. The episodes were written by McHale and Jordan, and saw "Holby City" registrar Jac Naylor accused of murder. Yorke compared the crossover to the American "CSI" franchise, in that: "You really believe it's a world." While the second series attracted 5.6 million viewers with its opening episode, by the end of May 2008 viewership had fallen to 2.5 million. In August 2008, the BBC announced that due to declining ratings, "Holby Blue" would not be recommissioned for a third series. In June 2002, cast members from "Holby City" and "Casualty" competed against the "EastEnders" cast for the first "Sport Relief" fundraiser, in a segment dubbed "Sport in the Square". The teams competed in events such as taxi pulling, melon tossing and a beer keg relay. The competition was televised on BBC One, and the event as a whole raised £10 million. In October 2003, BBC One aired a "Kenyon Confronts" documentary by "Panorama" reporter Paul Kenyon, investigating hospitals run by the Private Finance Initiative. He discovered many problems within the hospitals, which were dramatised by the "Holby City" cast in specially commissioned scenes. March 2004 saw the station air the documentary "Making It at Holby", as part of a BBC initiative to develop new acting talent. The documentary followed the casting process of "Holby City" and "Casualty", from the audition stages to the filming of the selected actors' first scenes. Young explained his casting criteria, stating: "I try to put my head into the head of a viewer and ask: do I want to spend three years in the life of this person?" The 17 November 2006 "Children in Need" charity telethon included a segment featuring the "Holby City" cast performing a comical version of "Hung Up" by Madonna. The 16 November 2007 "Children in Need" appeal again contained a musical performance from Holby City cast members. Sharon D Clarke, backed by Nadine Lewington, Rakie Ayola and Phoebe Thomas performed a soul version of Aretha Franklin's signature song, "Respect". On 28 June 2008, "Holby City" stars competed against their "Casualty" counterparts in a special charity edition of BBC Two game-show "The Weakest Link".