Billy Mitchell (EastEnders) revealed in 2006 that the role was extended by "coincidence and chance": "I was offered four episodes and here I am, about 800 later. [...] Ross Kemp (Grant) said that he was leaving, and there was a gap in the Mitchell family, so they brought me back to do stuff towards his leaving. After that they offered me a year." Billy was reintroduced in 1999, making recurring appearances. He was involved in the leaving storyline of Grant Mitchell in October 1999, before returning later in the year as a regular character. When Billy was first introduced, he was depicted as
Sam Mitchell (EastEnders) better off with Jack. Sam abandons Ricky at Jack's house and leaves in the back of a taxi. The character Sam Mitchell was introduced in July 1990 by "EastEnders"' executive producer Michael Ferguson as the young sister of the Mitchell brothers, Phil (Steve McFadden) and Grant (Ross Kemp). Sam was one of several characters introduced by the producer in the summer of 1990. Others included Eddie Royle (Michael Melia), and three generations of the Tavernier family. As the casting team had successfully cast the actors who were playing Sam's brothers, they already knew what facial attributes they needed for Sam