Laurence Payne

When a woman is found dead in London, Colonel March must determine whether it was suicide or murder; a French fencing match holds the vital clue.

A man and a dog are both killed by the shores of Loch Ness by what would appear to have been the monster.

Chessene and Shockeye succumb to their baser instincts and revert to their Androgum ways, while the Sontarans prepare the Second Doctor to trigger their Kartz-Reimer capsule.

The Second Doctor and Jamie visit space station Camera to speak to the scientist Dastari, but the station has a saboteur aboard - Chessene is working with the Sontarans.

The Doctor and Peri meet Jamie and learn the Second Doctor is with the Sontarans in Spain on Earth. At a Hacianda, Chessene and the Sontarans set up base.