Horror of Fang Rock is the first serial of the 15th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 3 to 24 September 1977. The serial is set on the fictional English island of Fang Rock in the early 20th century, where a shapeshifting alien scout called a Rutan arrives on Earth intending to use the planet as a strategic base in the Rutans' war against the Sontarans.