Despite a relatively short run, the series proved highly popular worldwide, gaining solid ratings in the US and particularly so in the UK (where it became the only science fiction program to achieve the No.1 position in the ratings during the 20th century). The series ran for three seasons, from 1976 to 1978, first on the ABC network and then the NBC network for its final season. Years after its cancellation, three spin-off TV movies were produced between 1987 and 1994. Reruns of the show aired on Sci-Fi Channel from 1993 to 2001. A remake of the series was produced in 2007.