Jack calls in an old friend for a favour, none other than Martha Jones, as they attempt to stop a pharmaceutical facility that uses aliens in the hope of discovering a cure for all diseases.
Quest roles:
Paul Kasey(Weevil), Alan Dale(Copley), Jan Anderson(Marie), Freema Agyeman(Martha Jones), Jacqueline Boatswain(Plummer), Rhodri Miles(Billy), John Samuel Worsey(Policeman)