On September 17, 1978, the uncut 148-minute pilot premiered on ABC to spectacular Nielsen Ratings (attracting 65 million viewers).
http://en.wikipedia....alactica_(1978)In mid-April 1979, ABC executives cancelled the still strongly-rated show. Some sources indicate that the million-dollar-per-episode cost led to the show's demise. Others believe that it was a failed attempt by ABC to position its hit comedy Mork & Mindy into a more lucrative timeslot. (The ratings for Mork plummeted far below what they had been for Battlestar Galactica.) The cancellation led to viewer outrage, protests outside ABC studios, and even contributed to the suicide of Eddie Seidel, a 15-year-old boy in Saint Paul, Minnesota who had become obsessed with the program. [1] On May 18, 1979, the theatrical version of the pilot was released in U.S. theatres.