 Martha returns again for the final two episodes of the series, "The Stolen Earth" and "Journey's End", where she has been promoted to a US division of UNIT and is working on a top secret teleportation project based on Sontaran technology.She rallies alongside fellow companions Jack and Sarah Jane Smith (Elisabeth Sladen) in an effort to face the threat of Davros' (Julian Bleach) plot to destroy reality.In facing Davros, Martha threatens to set off nuclear warheads which will destroy the Earth in order to spare human suffering and curtail his plans, but is stopped by The Doctor.