Mysterious forces are at work in 1930s Tibet. The once gentle Yeti have turned savage and besieged a Buddhist monastery. The Second Doctor, Jamie and Victoria arrive expecting a friendly welcome from the abbot, but soon become ensnared in the plans of the extradimensional being known as the Great Intelligence.
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Verdict: Unknown
> Gerald Blake (Director)
> Mervyn Haisman (Writer)
> Henry Lincoln (Writer)
> Peter Bryant (Script Editor)