Overview

The TARDIS narrowly avoids becoming engulfed in a cobwebby substance in space. It arrives in the London Underground railway system, the tunnels of which are being overrun by the web and by the Great Intelligence's robot Yeti. The time travellers learn this crisis was precipitated when Professor Travers, whom they first met in the Himalayas some thirty years earlier, accidentally caused one of the Yeti to be reactivated, opening the way for the Intelligence to invade again.

Details

Cast

Patrick Troughton

Frazer Hines

Deborah Watling

Nicholas Courtney

Jack Watling

Tina Packer

Jon Rollason

Ralph Watson

Jack Woolgar

Richardson Morgan