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This spin-off from the British cop series XYY Man was built around two of the earlier series' most popular characters, Detective Sergeants Bulman (Don Henderson) and Willis (Dennis Blanche). On this occasion, the two protagonists were attached to Unit 23, a Northern police squad assigned to handle difficult cases all over the British Isles. During the series' third year, the members of Unit 23 concentrated their efforts in a single crime-ridden district, and accordingly the group was renamed the Inner City Squad. Created by Murray Smith, Strangers was carried by Granada Television for 32 hour-long episodes from June 5, 1978 to October 20, 1982, ultimately yielding a spin-off of its own, Bulman.