Terror of the Zygons
By Robert Banks Stewart
“This one they call the Doctor is a threat to us. Already he has found out too much. He must be destroyed.”
Responding to the message from The Brigadier from the space/time telegraph he left him The Doctor, Harry and Sarah find them in present day Scotland. Apparently something is destroying oil rigs off the coast of Scotland and causing alarm as these rigs are huge and supposedly are unsinkable. The Doctor examines some of the wreckage that has washed ashore and found one particular piece of steel interesting. After using some plaster and making a mold The Doctor shows The Brigadier that the mold is of a giant tooth. What makes it impressive is that whatever is the owner of the tooth is strong enough to eat through steel as if it was paper.
There are strange things going on around the inn that UNIT is using as a base when Harry finds on of the oil riggers workers have come on shore they are both shot at killing the worker and grazing Harry on the head. Sarah does some investigating in the town and then informs The Doctor that Harry has been shot and goes and sees if he is ok at the infirmary at the Oil Company’s buildings. While there Harry starts to regain conscious Sarah goes and calls The Doctor. Sarah is telling him what Harry has been mumbling when she is attacked by an alien creature. It is a Zygon and they want to turn the Earth into a new home world for them to replace theirs which it was destroyed. So it’s up to The Doctor and UNIT to prevent this from happening and to find a way of stopping the Zygons and the Skarasen.