<

Name – Guardians of Time
Species – conceptual entities
Planet – None
Temperament – superior
Appearances – Enlightenment

The Guardians of Time are immensely powerful conceptual entities who embody the concept of Light/Order (White Guardian) and Darkness/Chaos (Black Guardian). They maintain the universal balance through an artefact known as the Key to Time. The existence of the Guardians was known to few. Among those were the Time Lords' High Council, and the Eternals, who called them Enlighteners. The White Guardian enlisted the help of the Fourth Doctor to gather the six segments of the Key to Time in order to restore the universal balance of the cosmos. Eventually the Doctor succeeded and assembled the Key, outwitting the Black Guardian and enabling the White Guardian to restore the balance.

 

The Black Guardian later used Turlough to try to kill the Fifth Doctor. The Guardians offered Enlightenment, symbolized by a crystal of unknown powers and great value, as the prize to the winner of a planet-spanning space race undertaken by the Eternals. The Black Guardian hoped that, with such a prize, the Eternals might wreak havoc throughout the Universe. Instead, the Fifth Doctor won the race but turned down Enlightenment. When Turlough threw the crystal at the Black Guardian, he vanished in a burst of flames. However, The White Guardian explained that the Black Guardian existed as long as he did, and would continue to do so until neither were needed any longer.