With the Great Intelligence on the verge of becoming corporeal, the Doctor challenges Padmasambhva to a mental battle in order to defeat it.
Quest roles:
David Spenser(Thonmi), Wolfe Morris(Padmasambhava), Norman Jones(Khrisong), Jack Watling(Professor Travers), Pat Gorman(Pilot), Charles Morgan(Gold Usher), David Baron(Ralpachan), Tony Harwood(Yeti), John Hogan(Yeti), Reg Whitehead(Yeti), Raymond Llewellyn(Sapan), Richard Kerley(Yeti)