Captain Alice Ferrin, Imperial ID 19-delta-13b, was in charge of the punishment platoon on Hedgewick's World of Wonder when it came under threat from the attack of long-thought extinct Cybermen.
Sent to Hedgewick's for not obeying orders, Ferrin was later stripped of her captain role by the Doctor with the role being handed out to Clara Oswald. Faced with the oncoming threat of the Cybermen, Ferrin knew the only way to stop them would be to implode the planet, but was killed by a strike from a Cyberman before she could carry out the implosion. (TV: Nightmare in Silver)