Strangers is a British television crime drama series, principally written and created by Murray Smith, and first broadcast on ITV on 5 June 1978. The series, featuring the characters of Detective Sergeant George Bulman (Don Henderson) and his assistant Detective Constable Derek Willis (Dennis Blanch), was a spin-off from the 1976 TV series The XYY Man, adapted from the novels of Kenneth Royce. The series was first suggested by Granada Television executives, who in 1977, outlined their plan to devise a new series to feature the regular characters of Bulman and Willis. "... I was sent here to be a stranger in town, a face they didn't recognise ..." - George Bulman The series began life as a fairly standard police drama, with Bulman positioned as its eccentric lead. The series' premise centred around a group of police officers, including Bulman and Willis, known as 'Unit 23', who are brought together from different parts of the country to Manchester to infiltrate areas and investigate crimes that familiar local detectives could not. Five series were broadcast, with the final episode airing on 20 October 1982. All five series of Strangers were released on DVD via the Network imprint as a complete box-set on 19 October 2009. Following the series, a further spin-off, simply entitled Bulman, ran for two series on ITV. It follows Bulman, again played by Don Henderson, as he retires from the police and becomes a private detective. Characters Initially Unit 23 consisted of Bulman, Willis and WDC Linda Doran (Frances Tomelty). Local liaison was provided by Detective Sergeant David Singer (John Ronane), while their superior officer was Detective Chief Inspector Rainbow (David Hargreaves). In the early years few episodes featured all five of these characters, most using just two or three of the regulars. The second series, shown in early 1979, introduced WDC Vanessa Bennett, played by Fiona Mollison, who replaced Frances Tomelty. David Hargreaves also departed the show following this series. For the third series Bulman, Willis, Bennett and the newly promoted Detective Inspector Singer became members of the Inter City Squad under the command of Detective Chief Superintendent Jack Lambie (Mark McManus). The basic premise was similar, but rather than covering just the Northwest of England the squad's remit extended to the whole country. By the fourth series Bulman had also gained promotion to Detective Chief Inspector. This series also reintroduced the semi-regular character William Dugdale