Look, Brigadier! It s growing! screamed Sarah.

The Brigadier stared in amazement as the robot began to grow and grow swelling to the size of a giant! Slowly the metal colossus, casting its enormous shadow upon the surrounding trees and buildings, began to stride toward the Brigadier. A giant metal hand reached down to grasp him. Can Doctor Who defeat the evil forces controlling the robot before they execute their plans to blackmail or destroy the world?

Tom Baker, who played the Fourth Doctor in the BBC TV series, reads Terrance Dicks complete and unabridged novelization, first published by Target Books in 1975.