To the Slaughter is a BBC Books original novel written by Stephen Cole and based on the long-running British science fiction television series Doctor Who.

Powerful forces are set to 'spruce up' Earth's solar system, clear away 'extra' items deemed unneeded, like asteroids and small moons.

Naturally, there are many that protest this plan and some are willing to commit violence to meet their goals.

In Cole's author's note, he states that his inspiration for the book was to explain away the discrepancy.

The Doctor still cannot see the colour violet, an ability he lost in Unnatural History.