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Jac is the go-to person for technical brilliance in UNIT. As Kate Stewart’s right hand woman, Jac is the genius manning banks of monitors, computer equipment and clever gadgets, delving into data. She devised and ran the algorithm to pinpoint the time and location of the Doctor’s farewell party in The Magician’s Apprentice and played a key role in establishing the location of kidnapped Osgood in The Zygon Invasion.

Sadly for Jac, she didn’t realise ‘Clara’ (Zygon-Bonnie) was leading her into a trap until it was too late, and her life ended at the electrically charged hands of a Zygon.