Ellie Bates

Captain Eleanor Giselle Bates (b. 8 January 1985), more commonly known as Ellie Bates was a Captain working in the British division of UNIT who eventually joined the Doctor and Amy Pond in the TARDIS. Some time when stationed somewhere in rural Scotland, she lost her left hand in an unknown accident to which she was the only surviving member of her squad. She has stayed silent about it ever since and has used a replacement cybernetic hand ever since.