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
Ross Kemp in Afghanistan the aftermath of PTSD. Unlike a "traditional" war documentary, the first series was firmly positioned by Kemp as being the "soldiers' story", focusing on the experiences of the soldiers at home and abroad, and also features the views of their families. With a personal connection with the Vikings, Kemp is an ardent supporter of the men and the mission, and his film makes many criticisms of the situation the soldiers find themselves in. During the filming of the first series, in one engagement the crew were pinned down by fire from the Taliban, with Kemp "nearly dying" with bullets passing