Echoes of Grey is a Big Finish Productions

Big Finish Productions

Big Finish Productions is a British company that produces books and audio plays based, primarily, on cult British science fiction properties...

 audiobook based on the long-running British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 science fiction

Science fiction

Science fiction is a genre of fiction dealing with imaginary but more or less plausible content such as future settings, futuristic science and technology, space travel, aliens, and paranormal abilities...

 television series Doctor Who

Doctor Who

Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a time-travelling humanoid alien known as the Doctor who explores the universe in a sentient time machine called the TARDIS that flies through time and space, whose exterior...

.

The Companion Chronicles "talking books" are each narrated by one of the Doctor's companions and feature a second, guest-star voice along with music and sound effects.

Plot

Zoe meets a girl who remembers her from The Whitaker Institute in Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

, when she was travelling with the Second Doctor

Second Doctor

The Second Doctor is the second incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He was portrayed by character actor Patrick Troughton....

, although Zoe doesn't immediately recall this.

Continuity

• Most of Zoe's memories of the Doctor were erased from her mind by the Time Lords at the end of The War Games
  The War Games
  The War Games is a serial in the British science fiction television series Doctor Who, which originally aired in ten weekly parts from 19 April to 21 June 1969. It was the last regular appearance of Patrick Troughton as the Second Doctor, and of Wendy Padbury and Frazer Hines as companions Zoe...
  
  .
• The framing story is continued in The Memory Cheats
  The Memory Cheats
  The Memory Cheats is a Big Finish Productions audiobook based on the long-running British science fiction television series Doctor Who....
  
  .

External links

• Big Finish Productions - Echoes of Grey