Expiry Dating (audio story)

 was the first story in the audio anthology The Tenth Doctor and River Song, produced by Big Finish Productions. It was written by James Goss and featured David Tennant as the Tenth Doctor and Alex Kingston as River Song.

Publisher's summary
The first time the Doctor met River Song, he saw her die. And now she's asking him on a date. Well, not a date, exactly... More of a mission.

But the Doctor isn't at anyone's beck and call. Or so he thinks. With billions of lives hanging in the balance, can the Doctor afford not to do whatever River wants? Whichever one of him she asks?

Plot
To be added

Cast

 * The Doctor - David Tennant
 * River Song - Alex Kingston
 * The Fifth Doctor - Peter Davison
 * The Sixth Doctor - Colin Baker
 * Borslav / Bird King / Maxim / Assassin - Glen McCready

The Doctor

 * The Fifth Doctor gets drugged by River and starts talking obsessively about her. Tegan Jovanka physically pins him to the wall and tell him "she's just not that into you".

The TARDIS

 * Melanie Bush convinces the Sixth Doctor to install a type of voicemail into the TARDIS console. She is trying to "drag him into the 1980s".

Continuity

 * The Sixth Doctor is travelling with Melanie Bush, who is from the 1980s. (PROSE: Business Unusual, TV: Terror of the Vervoids et al)
 * The Fifth Doctor receives River's message via his Space-time telegraph. (TV: Revenge of the Cybermen et al)
 * The Tenth Doctor vaguely recognises the Fifth Doctor in the brief glance he gets from bumping into him. (TV: Time Crash)
 * River Song is aware of Donna Noble's fate. (TV: Journey's End, Silence in the Library)
 * The Doctor's last meeting with Davros is fresh in his mind. (TV: The Stolen Earth/Journey's End)