Bloodtide (audio story)

 was the twenty-second story in Big Finish's monthly range. It was written by Jonathan Morris and featured Colin Baker as the Sixth Doctor and Maggie Stables as Evelyn Smythe.

A pseudo-historical story, it dramatised a portion of the studies made by Charles Darwin on the Galápagos Islands. It also marked the first appearance of the Silurians on audio.

Publisher's summary
The prehistoric Earth is dying. Thunderclouds roll across the skies, cloaking the land in darkness. The seas crash and boil as the rain turns to acid. The remnants of the Silurian race place themselves in suspended animation, deep below the surface.

One day they will awaken and reclaim their world...

The TARDIS has landed on the Galápagos Islands, a desolate outcrop of rocks shrouded in mist and fear.

In the settlement of Baquerizo Moreno, there are rumours that prisoners have been mysteriously disappearing from the gaolhouse. A fisherman has been driven insane by something he saw in the caves. And the Sixth Doctor and Eveyln are not the only new arrivals; there is also a young natural philosopher by the name of Charles Darwin...

Part One
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Part Two
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Part Three
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Part Four
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Cast

 * The Doctor - Colin Baker
 * Evelyn Smythe - Maggie Stables
 * Charles Darwin - Miles Richardson
 * Captain Fitzroy - George Telfer
 * Tulok - Daniel Hogarth
 * Governor Lawson - Julian Harries
 * Sh'vak - Helen Goldwyn
 * Greta Rodrigues - Jane Goddard
 * Emilio / Lokan - Jez Fielder
 * The Myrka - Rob Shearman & William Johnson

Scientists

 * The Doctor goes by the pseudonym "Albert Einstein".

Ships

 * The Doctor and Evelyn meet Darwin while he is on the HMS Beagle.

Theories and concepts

 * Monkton's Theorem states that no intelligent species is likely to leave behind fossils.

Continuity

 * The Silurians appear. (TV: Doctor Who and the Silurians, et al.)
 * The Myrka previously appeared in TV: Warriors of the Deep and PROSE: The Scales of Injustice.
 * The Third Doctor previously claimed to have met Darwin. (PROSE: Island of Death)
 * Many years later, the Seventh Doctor and Evelyn would reminisce about meeting Darwin. (AUDIO: A Death in the Family)
 * The Eighth Doctor later told his companion Charley Pollard that this experience "put [Darwin] off reptiles for life. Well, almost." (AUDIO: The Creed of the Kromon)
 * In a parallel universe in which the Valeyard killed the Sixth Doctor and acquired his seven remaining regenerations, the Valeyard and his companion Ellie Martin visited a Silurian bunker in the Galápagos Islands. This incident was observed by the Time Lord Vansell, Coordinator of the CIA. (AUDIO: He Jests at Scars...)