Leanne (Ghost Walk)

From Tardis Wiki, the free Doctor Who reference

Leanne was a tour guide for a ghost walk in a town in Yorkshire. She could hear voices. The Fifth Doctor made contact with her in the catacombs, and eventually followed her around. She was Sabaoth's conduit in the 21st century to allow him to be reborn. She managed to send the Doctor back in time for him to collect his companions. (AUDIO: Ghost Walk)