Surus

Surus was the name of a talking elephant who was featured in the Doctor's fictionalised story of Hannibal's journey through the Alps. Surus, along with the other fictional elements in the story, were created by the Doctor's Possibility Generator.

In the story, Surus and Hannibal threatened the Doctor in order to obtain his knowledge of the future of Hannibal's invasion and the Romans' plans. (NOTVALID: Auld Mortality)