Iarcho

Iarcho were a species destroyed by an Entity which perceived Time backwards.

The Iarcho were one of the last species to evolve in the universe. The Entity had perceived 2 other species to "devolve" into savagery and tried to warn the Iarcho of their fate. When they failed to respond to the threat, the desperate entity tried to force them to do so by presenting them more immediate dangers. The Iarcho was the first of many destroyed until the Time Lords revealed the entity's perception of time. (ST: From Eternity)