The Sirens of Time (audio story)

"The Sirens of Time" is the first in the series of Doctor Who Doctor Who Audio Dramas produced by Big Finish. Written and directed by Nicholas Briggs, the four part story features the Fifth, Sixth, and Seventh Doctors, with Peter Davison, Colin Baker, and Sylvester McCoy respectively reprising their roles from the original television series.

Publisher's Summary
Gallifrey is in a state of crisis, facing destruction at the hands of an overwhelming enemy. And the Doctor is involved in three different incarnations - each caught up in a deadly adventure, scattered across time and space. The web of time is threatened - and someone wants the Doctor dead.

The three incarnations of the Doctor must join together to set time back on the right track - but in doing so, will they unleash a still greater threat?

Cast

 * Fifth Doctor - Peter Davison
 * Sixth Doctor - Colin Baker
 * Seventh Doctor - Sylvester McCoy
 * Commander Raldeth - Andrew Fettes
 * Coordinator Vansell - Anthony Keetch
 * The President - Michael Wade
 * Elenya - Sarah Mowat
 * Ruthley - Maggie Stables
 * Sancroff - Colin McIntyre
 * Commandant - John Wadmore
 * Lt Zentner - John Wadmore
 * Captain Walther Schweiger - Mark Gatiss
 * Schmidt - Andrew Fettes
 * Helen - Sarah Mowat
 * The Temperon - Nicholas Briggs
 * Ellie - Sarah Mowat
 * Pilot Azimendah - John Wadmore
 * Captain - Mark Gatiss
 * Delegate - Nicholas Pegg
 * Sub-Commander Solanec - John Wadmore
 * Knight Commander Lyena - Sarah Mowat
 * Knight 2 - Mark Gatiss

References from Sirens altered timeline

 * The Doctor prevents the RMS Lusitania‎ from being sunk.

Continuity

 * The Fifth and Seventh Doctors meet/met in Cold Fusion.
 * The Knights of Velyshaa are mentioned and a Knight appears in Dalek Empire: Invasion of the Daleks.
 * Vansell reappears in The Apocalypse Element and Neverland.
 * According to Instruments of Darkness Evelyn was in the TARDIS while the Doctor was at the the Kurgon Wonder.

Timeline
According to Big Finish, the events portrayed in this story are said to take place from each Doctor's perspective as follows:


 * Fifth Doctor - between The Five Doctors and Warriors of the Deep
 * Sixth Doctor - between The Trial of a Time Lord and Time and the Rani
 * Seventh Doctor - prior to Doctor Who: The TV Movie