The Doctor is still exiled to Earth by his own people and working for U.N.I.T. He is joined by Jo Grant, who is employed by U.N.I.T to assist the Doctor, after Liz Shaw went back to Cambridge.
The Doctor is warned by one of his own people that an old acquaintance, a renegade Time Lord known as the Master, has arrived on Earth with plans to cause trouble.






The Master arrives on Earth in his TARDIS, camouflaging it as a horse box in a Circus.
The Master, has assumed control at the plastics factory and is manufacturing new lines of living plastics.
The Doctor and the Brigadier trace the Master to the plastics factory but they are too late.
The Doctor catches up with his old enemy, the Master. Can anyone stop the Nestene Consciousness?
The Doctor and Jo watch a demonstration of the Keller Machine which can extract evil impulses from criminals.
A full scale riot takes place at the Prison and Jo is taken hostage.
The Master is behind the Keller Machine and uses it to recruit the rioting inmates at Stangmoor Prison.
The mind parasite within the Keller Machine becomes too powerful for the Master to control.
The Master forms an uneasy alliance with the Doctor so that between them they can subdue the Keller Machine.
The Keller Machine breaks free of the Doctor's restraining device. The Doctor turns it against the Master.
Axos, a living spacecraft, lands and offers Earth a new energy source - Axonite.
The Doctor quickly discovers that the miracle Axonite substance is not as benign as it seems...
Axos puts its plan to drain the Earth of its energy in motion. The Brigadier must turn to an unlikely ally to stop it…
The Claws of Axos are deeply embedded in the Earth's carcass.
The Doctor and Jo arrive on a barren world in the far future where human colonists are scratching a living.
The Interplanetary Mining Corporation, represented by Captain Dent, arrives on the planet.
When Jo attempts to break into the IMC ship to find incriminating information, she is captured and held hostage.
The Master arrives, posing as an adjudicator from Earth who has come to settle the dispute.
With Jo held prisoner in his TARDIS, the Master forces the Doctor to take him to the underground city.
In the underground city, the Doctor and the Master confront the guardian of the doomsday weapon.
The Doctor tries to prevent Professor Horner from breaking into an ancient barrow near the village of Devil's End.
The Doctor and Jo return to the barrow where they are confronted by the gargoyle, Bok.
The Doctor attempts to help the Brigadier penetrate the heat barrier but is attacked by the Master's servant.
The Doctor is captured by the villagers who are under the Master's control.
UNIT have penetrated the heat barrier and launch an attack on the gargoyle, Bok.
Third Doctor
Jon Pertwee
Alistair Gordon Lethbridge-Stewart
Nicholas Courtney
The Master
Roger Delgado
Jo Grant
Katy Manning
Mike Yates
Richard Franklin
John Benton
John Levene
Rex Farrel
Michael Wisher
McDermott
Harry Towb
Time Lord
David Garth
Radio Telescope Director
Frank Mills
Professor Philips
Christopher Burgess
Goodge
Andrew Staines
Rossini
John Baskcomb
Museum Attendant
Dave Carter
Farrel Senior
Stephen Jack
Mrs. Farrel
Barbara Leake
Strong Man
Roy Stewart
Third Doctor
Jon Pertwee
Brownrose
Dermot Tuohy
Telephone Mechanic
Norman Stanley
Policeman
William McGuirk
Auton Policeman
Terry Walsh
Auton Leader
Pat Gorman
Third Doctor
Jon Pertwee
Alistair Gordon Lethbridge-Stewart
Nicholas Courtney
Jo Grant
Katy Manning
Mike Yates
Richard Franklin
Captain Chin Lee
Pik-Sen Lim
Prison Governor
Raymond Westwell
Dr. Summers
Michael Sheard
Professor Kettering
Simon Lack
Barnham
Neil McCarthy
Corporal Bell
Fernanda Marlowe
Linwood
Clive Scott
Chief Prison Officer Powers
Roy Purcell
Senior Prison Officer Green
Eric Mason
The Master
Roger Delgado
John Benton
John Levene
Mailer
William Marlowe
Vosper
Haydn Jones
Fu Peng
Kristopher Kum
Senator Alcott
Tommy Duggan
Charlie
David Calderisi
Major Cosworth
Patrick Godfrey
Fuller
Johnny Barrs
Main Gate Prisoner
Matthew Walters
Third Doctor
Jon Pertwee
Third Doctor
Jon Pertwee
Alistair Gordon Lethbridge-Stewart
Nicholas Courtney
The Master
Roger Delgado
Jo Grant
Katy Manning
Mike Yates
Richard Franklin
John Benton
John Levene
Chinn
Peter Bathurst
Filer
Paul Grist
Hardiman
Donald Hewlett
Winser
David Savile
Axon Man
Bernard Holley
Captain Harker
Tim Pigott-Smith
1st Radar Operator
Michael Walker
2nd Radar Operator
David G March
Axon Woman
Patricia Gordino
The Minister
Kenneth Benda
Third Doctor
Jon Pertwee
Alistair Gordon Lethbridge-Stewart
Nicholas Courtney
Jo Grant
Katy Manning
Winton
Nicholas Pennell
Ashe
John Ringham
Leeson
David Webb
Jane Leeson
Sheila Grant
Norton
Roy Skelton
Mary Ashe
Helen Worth
Martin
John Line
Mrs. Martin
Mitzi Webster
Primitive
Pat Gorman
Time Lord
Peter Forbes-Robertson
Time Lord
John Baker
Time Lord
Graham Leaman
IMC robot
John Scott Martin
Caldwell
Bernard Kay
Dent
Morris Perry
Morgan
Tony Caunter
Holden
John Herrington
Allen
Stanley McGeagh
Long
Pat Gorman
The Master
Roger Delgado
Alec Leeson
John Tordoff
Guardian
Norman Atkyns
Primitive
Pat Gorman
Alien Priest
Roy Heymann
The Master
Roger Delgado
Colonist
Pat Gorman
Third Doctor
Jon Pertwee
Alistair Gordon Lethbridge-Stewart
Nicholas Courtney
The Master
Roger Delgado
Jo Grant
Katy Manning
Mike Yates
Richard Franklin
John Benton
John Levene
Miss Hawthorne
Damaris Hayman
Bert the Landlord
Don McKillop
Winstanley
Rollo Gamble
Prof. Horner
Robert Wentworth
Alastair Fergus
David Simeon
Harry
James Snell
Garvin
John Joyce
Dr. Reeves
Eric Hillyard
Tom Girton
Jon Croft
PC Groom
Christopher Wray
Baker's Man
Gerald Taylor
Bok
Stanley Mason
Sgt. Osgood
Alec Linstead
Thorpe
John Owens
Azal
Stephen Thorne
Jones
Matthew Corbett