World Game is a BBC Books original novel written by Terrance Dicks and based on the long-running British science fiction television series Doctor Who.

Under threat of execution after his conviction by the Time Lords at the end of The War Games, the Doctor is granted a reprieve if he agrees to undertake missions for the Celestial Intervention Agency.

Accompanied and supervised by the ambitious Lady Serena, their first mission is to halt attacks upon three key figures in Earth's past: Napoleon Bonaparte, The Duke of Wellington, and Charles Maurice de Talleyrand.

The Doctor re-encounters the Player known as the Countess and struggles to end her Grand Plan to allow Napoleon to win his various European campaigns.

The Countess has many back up plans, and at the Battle of Waterloo, her plan to prevent the Prussians coming to the English army's relief is thwarted when the Doctor imitates Napoleon himself to get through the French lines and deliver new orders to the Prussian commander Gebhard Leberecht von Blücher.