Amelia Geller

Dr Amelia Geller was an associate of Bernice Summerfield. She wanted to get Benny's attention when she was in trouble. She was an archaeologist. She later untied Benny and the Seventh Doctor from the bonds that the native Serpentiles had placed them in. She died, but was resurrected as a zombie, and started to decay. (AUDIO: The Revolution)

Behind the scenes
Although Nicola Bryant is credited as playing "Professor Geller", she is referred to as "Dr Geller" in the actual story.