Animal Instinct was the second story of the audio anthology, The Diary of River Song: Series Five. It was written by Roy Gill and featured Alex Kingston as River Song and Geoffrey Beevers as the Decayed Master.
And if they are going to escape this place alive, they all must work together.
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- River Song - Alex Kingston
- The Master - Geoffrey Beevers
- Luke Sullieman - Timothy Blore
- Dav Christos / Therian Leader - Delroy Atkinson
- Adella Franz / Therian - Emily Woodward
- River uses a sonic pen torch.
- The Master entered his tomb on Cheska Minor, but woke up on Cheska Major.
- The Master possesses an Obsidian Mirror.
- River compares the Master's style to Moriarty.
- The Master asks, "Who was it said 'Humans should never invite their ancestors round for dinner?'" This both a reference to The Hitchhiker's Guide to the Galaxy and its author, the late Douglas Adams who both wrote and script-edited episodes of the classic series. This is also asked by the Seventh Doctor in the Season 26 story Ghost Light.
- The scene where Luke Sullieman and River Song discover the Master was illustrated by Jamie Lenman for The DWM Review in DWM 535.
- River reveals to the Master that she married the Doctor. (TV: The Wedding of River Song)
- The Master suggests that he should look into River's background. He will eventually do so by the time of his War incarnation. (AUDIO: Concealed Weapon)
- The Master will later be stranded on another planet inhabited by human-feline hybrids, the Cheetah World. (TV: Survival)