Blood Heat is an original novel written by Jim Mortimore and based on the long-running British science fiction television series Doctor Who.

An embittered alternate version of the Brigadier, along with Liz Shaw and the remnants of UNIT, attempts to destroy the Silurians with nuclear missiles.

In order to save their Universe, the Doctor time rams his old TARDIS in order to start a chain reaction that will destroy the parallel universe after the current inhabitants have lived out the rest of their lives, vowing simultaneously to find whoever created this timeline and bring them to justice.

When Ace and Bernice leave the Doctor alone, he pushes a lever, destroying the Alternate Earth automatically.

Ace meets an adult version of her childhood friend Manisha, first mentioned in the season 26 serial Ghost Light.