final episodes of each serial would have a cliffhanger that would lead into the next serial. The programme's cliffhangers sometimes caused controversy, most notably Part Three of The Deadly Assassin (1976), which was altered for future broadcasts following a complaint from campaigner Mary Whitehouse. Whitehouse objected to the violence of the scene (the Doctor's head is held underwater in an attempt to drown him). She often cited it in interviews as one of the most frightening scenes in Doctor Who, her reasoning being that children would not know if the Doctor survived until the following week and that they would "have this strong image in their minds" during all that time. The producer of Doctor Who at the time, Philip Hinchcliffe, cited the 1950s radio serial Journey into Space as an influence for its use of cliffhangers. A later serial, Dragonfire (1987), is notable for having a cliffhanger that involved the Seventh Doctor literally hanging from a cliff, seemingly by choice, which has been described as "the most ludicrous ever presented in Doctor Who". Another British science fiction series, Blake's 7 (1978–1981), employed end-of-season cliffhangers for each of the four seasons the series was on air, most notably for its final episode in 1981 in which the whole of the main cast are seemingly killed. The final cliffhanger was never resolved. From 1966 to 1968 and in broadcast syndication, “Same bat-time, same bat-channel” encouraged viewers to tune in the next night for 120 episodes of Batman (TV series). The next episode quickly resolved the hero's from each supervillain's trap. A few triple episodes had double cliffhangers. Cliffhangers were rare on American primetime television before 1980, as television networks preferred the flexibility of airing episodes in any order. The sitcom Soap was the first US primetime television programme to utilise the end-of-season cliffhanger, at the end of its first season in 1978. Cliffhangers then went on to become a staple of American primetime soap operas; the phenomenal success of the 1980 "Who shot J.R.?" third season-ending cliffhanger of Dallas, and the "Who Done It" fourth-season episode that finally solved the mystery, contributed to the cliffhanger becoming a common storytelling device on American television. Another notable cliffhanger was the "Moldavian Massacre" on Dynasty in 1985, which fueled speculation throughout the summer months regarding who lived or died when almost all the characters attended a wedding in the country of Moldavia, only to