The Sirens of Time is a 1999 audio drama based on the long-running British science fiction television series Doctor Who.

It was the first Big Finish Productions audio drama based on the series and became the first in the company's Main Range.

The story was written and directed by Nicholas Briggs, and stars Peter Davison, Colin Baker and Sylvester McCoy, who reprise their roles as three incarnations of the Doctor.

Davison and Baker were praised for their vocal performances, while the story itself received mixed reception for its format.

Arriving at the quicksand, the Doctor wonders why the hag had not tried to save Elenya, and takes her back to the TARDIS.

Over a communicator, she reports to a commandant who questions her over ion trails he has detected in her sector but she denies knowledge of them.

Hearing the crash, Sancroft asks Ruthley if the planet's shields are failing, but she then taunts him that no one is coming to his rescue.

Ruthley is heard communicating with an alien voice on the ship, which informs her that bio-assassin cultures will activate on landing.

Ruthley speaks to a planetary security robot, a Drudger, and commands it to eliminate the Doctor and Elenya, but it tells her that that procedure is not permitted.

Thinking she has done a deal with them, Ruthley approaches the bio-assassins and tells them that infamous Sancroft, First Knight of Velyshaa, is there for ready them to kill.

The bio-assassin plays a recorded message – Sancroft has been sentenced to death for war crimes against the people of Calfadoria.

The submarine crew spot two survivors clinging to a box floating in the debris of the remains of the ship.

The Doctor pretends to be a German spy, telling him that proof of his identity is in an airtight crate now floating in the sea.

The Doctor is still alive, and Helen taking Schmidt's gun shoots and kills the German.

The Doctor however is still unable to reunite with his companions inside the TARDIS and realises that the Time Lords wish him to be dead.

On Gallifrey, Vansell discovers that a female presence exists inhabiting the vortex at each of the nexus points at which the Doctor has been observed.

He has found a further incident involving the Sixth Doctor and the legendary time beast, the Temperon, in the Kurgon system.

The Sixth Doctor finds himself at some kind of conference on a space ship where a waitress seems very familiar to him.

However, a particle field quickly surrounds the ship – the Doctor identifies it as a shard of time distortion.

With the exception of the Doctor, a waitress named Elly and an android pilot, everyone on board is aged to death by the disruption.

Vansell is also shot but manages to send a final message through the pilot's positronic brain: "do not free the Temperon."

Elly reveals that she is part of an organisation dedicated to freeing a being they believe is trapped in the Kurgon Wonder.

As the Doctor is smothered by the Temperon it issues a final warning: "Beware the Sirens of Time."

All three Doctors are brought before Lyena who reveals that subjugated Time Lords are being used to revitalise the Knights.

Although the outcome of the First World War was not greatly affected, a common criminal on board the ship who should have died went on to murder Alexander Fleming.

When the Sixth Doctor freed the Temperon, its destruction allowed the Knights to gain the powers of Time Travel.

When they suggest they should release the Temperon, Lyena immediately refuses and orders the Doctors be arrested.

Doctor Who hadn't been on the air since the 1996 American TV film failed to create a new series of the show.

Titled Talking 'Bout My Regeneration, this documentary considered the history of the show in audio and featured behind the scenes interviews with the cast and production crew.

[6] In March 2021, coinciding with the end of The Monthly Adventures, Big Finish made The Sirens of Time available to download for free.