[5] In David Whitaker's script for The Wheel in Space, Zoe's last name is spelled "Heriot",[6] but the double-"r" misspelling is also seen in reference works.

Coupled with her photographic memory[8] and the advanced learning techniques of her era, this makes her somewhat like a human calculator, able to perform complicated mathematics in her head.

Zoe describes her life after the events of The War Games; she married an Australian man, has a scientist son she named James, and is currently serving her third term as president.

She has returned as Zoe in several more Big Finish plays such as Echoes of Grey and her second Companion Chronicle, Prison in Space, based on an unmade TV story.

Although this part of her plan fails, the audio ends with Zoe using a computer virus that has mutated to attack physical matter to destroy the Company and escape, although her mental state and memories of her time with the Doctor are still lost.

The novelisation of the TV serial The Mind Robber mentions, in passing, that Zoe discussed that adventure "long afterwards",[10] suggesting that she eventually recovered some or all of her lost memories.