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|Place of origin:||Earth|
|Appearance:||Vampire of the Mind|
|Main actor:||Kate Kennedy|
Heather Threadstone was the daughter of Professor Threadstone and a scientist herself, like her father. Like her father, she was a friend of the Sixth Doctor, and accompanied him during the investigation of the Dominus Institute in 2016. (AUDIO: Vampire of the Mind)
Behind the scenesEdit
While she has so far only appeared once, she is nonetheless called a new companion of the Sixth Doctor in the behind the scenes interviews on the Vampire of the Mind (audio story) CD.