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: Extreme World confirmed via Kemp's official Twitter account that "Extreme World" would return for a fifth series, with filming beginning in the summer of 2015. Filming continued through to December, before taking a three-week break over the Christmas period. Filming restarted in January 2016. Filming once again broke in April 2016, due to Kemp filming scenes for his brief return to "EastEnders". Filming on the series finished in May 2016. A sixth series has since been confirmed for broadcast in 2017, beginning with a special feature-length episode, "Libya's Migrant Hell", on 21 February 2017. However, the sixth series of "Extreme World" will