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Deep Blue was the nineteenth novel in the BBC Past Doctor Adventures series. It was written by Mark Morris, released 1 March 1999 and featured the Fifth Doctor, Tegan Jovanka and Vislor Turlough.

It also featured UNIT, Brigadier Alistair Gordon Lethbridge-Stewart, Captain Mike Yates and Sergeant John Benton. Also, it sees a character development for Tegan, with her falling in love in this novel.

Publisher's summary[]

When a lighthouse keeper reports seeing a ball of light plunging into the sea off Tayborough Sands, UNIT sends Mike Yates to investigate. The last thing he expects to find there is an old friend — with a new face...

The Doctor and his companions arrive on a pleasure beach in the 1970s, hoping for time off after their latest adventures. But they do not get to relax for long. Violent incidents are at an all time high in the area and people are going missing — or else changing into something more than human...

The Doctor soon realises a sinister presence lurks in the cold seas off Tayborough Sands — a presence with sinister designs on humanity.


to be added



The Doctor[]



  • The Doctor explains that the TARDIS has an in-built function that allows it to home in on suitable areas for materialisation, which is why it never materialises in solid rock or under water.
  • The Xaranti virus or plague, which they call "Xaranti energy," is psychological: people infected think they're becoming Xaranti, so they physically mutate.

Foods and beverages[]

  • The Doctor buys a 99 ice cream with glittering purple shells.
  • Tegan orders a glass of white wine in the Captain Cook.


  • With references to a Pleasure Beach and attractions such as a ghost train, Tayborough Sands features many similarities with the town of Blackpool.
  • This story takes place 10 or so years before Tegan's time, no more than 12, so circa 1974. Mike tells the Doctor the year. See UNIT dating controversy.


External links[]