The Roof of the World starts well, with the 5th Doctor dragging Peri and Erimem along to a cricket match in Tibet, while an ancient evil is reawakening in the Himalayan Mountains. Unfortunately after a fine first episode things deteriorate, with an extended series of visions for Erimem ruining the pacing, and a disappointing last minute TARDIS hop up the mountains taking the place of any more dramatic climb for the Doctor and Peri. The basic story is uncomfortably close to that of The Abominable Snowmen, only with the Great Intelligence replaced by H.P. Lovecraft's Great Old Ones (though, it must be said - a rather feeble version). Some nice performances, but ultimately from a strong start The Roof of the World gets progressively more disappointing the longer it goes on, and ends up a decidedly average adventure for all concerned. Neither the best Cthulhu Mythos inspired Who story, nor the best set in the Himalayas - The Roof of the World competently goes over old ground, but doesn't break into any new territory.