Travis (Doctor Who and the Silurians)

Travis was a technician at the Wenley Moor nuclear research facility. He informed Dr Charles Lawrence that Edward Masters had arrived. (TV: Doctor Who and the Silurians)

Behind the scenes
In the novelisation Doctor Who and the Cave-Monsters, Travis is female. She has an expanded role in the novelisation, and is key to stopping the facility's nuclear reactor from overloading; in the original TV story, the Third Doctor figures it out on his own.