monastery. Realising the monks will not leave peacefully, Abbot Songsten opens the gates of the monastery to more Yeti. Victoria realises Padmasambhava is the one commanding the Yeti robots. He wipes her mind of their meeting and summons more Yeti to attack. The Doctor helps Victoria recover from her trance-like state and listens to Travers, who is recovering his senses and explains about the cave and the pyramid. The Doctor pieces together the nature of the threat while Travers recalls that Songsten was in the cave too. It is clear Songsten is the link between the Yeti and the monastery. The Doctor and his friends arrive and overpower Songsten. Songsten is bound and returned to the other monks, and the violence of his manner persuades them that he is the threat to Detsen. The Doctor, Thonmi, and Jamie destroy the equipment being used to control the robotic Yeti. Left in peace, Padmasambhava dies. With the danger over, the travellers depart. Travers accompanies them up the mountain and his belief in the real Yeti is renewed when he spots one. He charges off to investigate as the TARDIS departs. Production Episode is missing All episodes except for episode 2 are missing. Brief clips from episode 4 exclusively focusing on the Yeti also exist. The North Wales mountain pass at Nant Ffrancon doubled as Tibet for the filming of this serial. Filming was done there from 4 to 9 September 1967. According to Jack Watling one of the actors playing the Yeti fell hundreds of feet during filming and was feared dead, but was merely inebriated and fortunately cushioned by the foam rubber inside the costume. Cast notes The character of Professor Travers is played by Jack Watling, the father of actress Deborah Watling, who plays Victoria. Norman Jones later played Major Baker in Doctor Who and the Silurians (1970) and Hieronymous in The Masque of Mandragora (1976). Ralpachan is played by David Baron, often said to be the playwright Harold Pinter under a stage name. Pinter has since denied this rumour. David Baron was indeed Pinter's name for the purposes of Equity, the British actors' union, but he had relinquished it by the time this serial was produced. Commercial releases In print A novelisation of this serial, written by Terrance Dicks, was published by Target Books in November 1974. Audio The audio soundtrack, along with additional linking narration by Frazer Hines,