Phyllis Dawson

Phyllis Dawson was Dr John Quinn's assistant at the Wenley Moor nuclear research facility. He told her of his contact with the Silurians under Wenley Moor. When the Silurians killed Quinn, Dawson advocated UNIT attacking them in force. She later caught the Silurian virus. (TV: Doctor Who and the Silurians)

Behind the scenes
Dawson's first name Phyllis is only given in the novelisation.