Intro: The controversy over the existence of the Loch Ness Monster has raged for years. Tonight we will learn what really lies at the bottom the lake, and it is moot whether their number or their appearance will prove more surprising. A good dermatologist with an aqualung might be beneficial, but the Doctor will have to forego that luxury in his battle against the "Terror of the Zygons."

Outro: Next week, the Doctor and Sarah leave Loch Ness on their way to London. Circumstances will cause them to make a slight detour to a planet on the outermost edge of the known universe, "The Planet of Evil." [source: ChicagoEpguides]