Terror of the Zygons

Terror of the Zygons is the first serial of season thirteen of Doctor Who. First airing in 1975, it tells of the Doctor discovering the identity of the Loch Ness Monster.
== Characters ==
* Fourth Doctor - Tom Baker
* Sarah Jane Smith - Elisabeth Sladen
* Harry Sullivan - Ian Marter
rest to be added
== Summary ==
Having received an urgent request for assistance from the Brigadier, the Doctor, Sarah and Harry arrive in Scotland, where they discover that a mysterious force has destroyed three oil rigs.
The mystery deepens when a piece of wreckage is found with giant teeth marks on it. The trail leads them to the shores of Loch Ness where they find that the legendary monster really does exist — and is the murderous tool of the Zygons, aliens intent on overpowering the planet.
The Doctor, his companions and UNIT must find a way to defeat the deadly Loch Ness Monster and its controllers, but the Zygons have the terrifying power to change shape. The Doctor's life has never been in more danger, as the line between allies and enemies is tested to the very limit...
Category:Robert Banks Stewart
Category:Douglas Camfield
Category:Doctor Who
Category:1975