Day of the Cockroach
Helen Atkins was a human woman. She was a counsellor.
In 1982 she was hiding inside a British nuclear bunker because she thought they had a nuclear war. She worked as a cook in the bunker. However, more and more people were killed by giant cockroaches. The Eleventh Doctor found out that the cockroaches were manipulating the human minds and making them think that there was a nuclear war outside. They wanted to keep the humans at the bunker as a food supply. Helen and the other surviving inhabitants later left the bunker. (Day of the Cockroach)