With the Clantons believing the Doctor to be Doc Holliday, Wyatt Earp takes him into protective custody but this leaves Steven and Dodo in danger.
Quest roles:
Peter Purves(Steven), Jackie Lane(Dodo Chaplet), John Alderson(Wyatt Earp), Richard Beale(Minister of Ecology), David Graham(Kerensky), Lynda Baron(Captain Wrack), Maurice Good(Phineas Clanton), Sheena Marshe(Kate), Shane Rimmer(Seth Harper), William Hurndell(Ike Clanton), David Cole(Billy Clanton), Anthony Jacobs(Doc. Holliday)