Starring: Sarah Sutton, Derek Carlyle

While investigating a debris-littered battlefield, the TARDIS crew are salvaged by an ancient race of collectors known as Dar Traders. Separated from the Doctor, Adric, Tegan and Nyssa find themselves at the mercy of the Traders’ curiosity.

Starring: Colin Baker, India Fisher

What seemed like a mere mystery ends up being a life or death struggle at the centre of an interplanetary war in which the stakes are so high, the Doctor or Charley must gamble and lose their identity...

Starring: Peter Davison, Sarah Sutton

It's been hundreds of years and several regenerations since the Doctor last visited the insect world of Vortis. Much has changed during his absence, but not necessarily for the better. This green and pleasant land isn't the paradise it first appears...

Starring: David Warner, Nicholas Courtney, Terry Molloy

The Doctor and his companion Alistair Lethbridge-Stewart take a random trip in the TARDIS, and land on Skaro. The Doctor helped the Thals to defeat the Daleks years ago, so he is surprised to find the Thal city under Dalek occupation.