Temporal flux

Temporal flux was an irreversible alteration to history which occurred when the effects of the Last Great Time War entered real-time.

The Sontarans' battle computers indicated that the planet Drakkis has been at peace for its entire existence before its sector of space was contaminated by temporal flux. Other planets had suffered the same. (AUDIO: The Sontaran Ordeal)

The Tenth Doctor tried explaining the mechanics of infinite temporal flux to Martha Jones. (TV: The Shakespeare Code