The Tenth Planet of malevolent cyborgs that became a recurring adversary in later "Doctor Who" stories. The "tenth planet" in the title makes reference to a fictional lost planet in Earth's Solar System; at the time of production, the Solar System was generally held to consist of nine planets, prior to the redesignation of Pluto as a minor planet. "The Tenth Planet" is an incomplete "Doctor Who" serial – one of many serials that were affected by the BBC's policy of wiping archived programmes in the 1960s and 70s. Only three of the four episodes are currently held in the BBC archives; the
Gustav Holst which "Swansea Town", with its "sophisticated tone", is deemed by Dickinson to be the most memorable. Holst downplayed such music as "a limited form of art" in which "mannerisms are almost inevitable"; the composer Alan Gibbs, however, believes Holst's set at least equal to Vaughan Williams's "Five English Folk Songs" of 1913. Holst's first major work after "The Planets" was the "Hymn of Jesus", completed in 1917. The words are from a Gnostic text, the apocryphal Acts of St John, using a translation from the Greek which Holst prepared with assistance from Clifford Bax and Jane Joseph. Head comments on