DOCTOR WHO IN DETAIL

Katarina joined the crew of the TARDIS while fleeing from the destruction of Troy; she had been one of Cassandra's serving girls.

She sacrificed herself to save the Doctor; when a convict was threatening to kill everyone on a ship she opened the airlock flinging the convict and herself out into space.

First regular appearance: The Myth Makers

Final regular appearance: The Daleks' Masterplan