Player

'' Players were a group of the Immortals, who tampered with history to amuse themselves. They had travelled through time so much and lived so long that they could no longer remember what they were or where they were from, though it was claimed that they were actually advanced humans. (PROSE: Deadly Reunion)

The Players attempted to start World War III in 1951 by plunging America and Russia into nuclear war. The Players used agents to influence the mind of Harry S. Truman in the White House, but were prevented when the Eighth Doctor informed the Secret Service of their plan.

In Russia, the Countess seduced Josef Stalin, and whispered in into his ear whilst he slept that China and America were aiming nuclear missiles at his cities. The Doctor convinced her to abort her game as she saw more potential to destroy the Earth in its future. (PROSE: Endgame)