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 (Series 6) will be made up of 6x60 minutes episodes, the series began on 21 February with a "Libya's Migrant Hell Special" with the rest of the series to air later in the year. Ross Kemp: Extreme World (Series 6) The sixth and final series of , began airing on 21 February 2017 and comprises 6x60 minute episodes, it is the final series of the TV series Extreme Worlds due to Sky One not renewing the show. It was announced that Extreme World would be renewed for a sixth series to air in 2017, filming begun in later 2016 and continued into