Doctor Who and the Giant Robot

"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 towards the Brigadier. A giant metal hand reached down to grasp him. Can the Doctor defeat the evil forces controlling the Robot before they execute their plans to blackmail or destroy the world?