Katarina (Adrienne Hill) first appears in "The Myth Makers". She is a handmaiden of the prophetess Cassandra, the princess of ancient Troy. After Vicki stays behind in Troy, Katarina takes her place. During "The Daleks' Master Plan", Katarina is taken hostage by the escaped prisoner Kirksen. He demands that the Doctor take him to Kembel, a planet taken over by the Daleks. To prevent the Doctor giving in to Kirksen's demands, Katarina triggers the controls to the airlock she is being held in. That sends both her and her captor into the vacuum of space. She is the first companion in the series to die.