The Master, disguised as Professor Thascales, is working at the Newton Institute in Wootton just outside Cambridge, on a device called TOMTIT, (Transmission of Matter through Interstitial Time) a machine which would enable him to go through Time to Atlantis and steal the Crystal of Kronos, thus giving him control over Kronos, an entity that feeds on Time itself. The Master uses a medallion from Krasis to summon Kronos who appears as a giant white bird like creature, but fails to control Kronos the Chronavore in the 20th century and decides to go back in Time to Atlantis. The Doctor follows him but fails to prevent him from using the Queen of Atlantis to gain access to the Great Crystal. Betrayed by the Queen, the Master unleashes Kronos and orders him to destroy Atlantis. The two Time Lords fight again in the time vortex. Their two TARDISes collide - but they are saved by Kronos, who now looks and sounds like a woman.  Kronos is grateful to the Doctor and intends to punish the Master. The Doctor pleads for the Master's release and by promising that the Master will be handed over to the authorities on Earth, obtains his freedom. The Master seizes the opportunity and escapes in his own ship.
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The Doctor:  Jon Pertwee
Jo Grant: Katy Manning
Brig. Lethbridge-Stewart: Nicholas Courtney
Captain Yates: Richard Franklin
Sergeant Benton: John Levene

Guest Appearances:
The Master: Roger Delgado
 Dr. Ingram: Wanda Moore
 Stuart Hyde: Ian Collier
 Dr. Percival: John Wyse
 Window Cleaner: Terry Walsh
 Dr. Cook: Neville Barbe
 Procter: Barry Ashton
 Krasis: Donald Eccles
 Hippias: Adrian Murphy
 Neophyte: Keith Dalton
 Kronos: Marc Boyle
 Dalios: George Cormack
 Knight: Gregory Powell
 Sergeant: Simon Legree
 Officer: Dave Carter
 Farm worker: George Lee
 Galleria: Ingrid Pitt
 Lakis: Susan Penhaligon
 Miseus: Michael Walker
 Crito: Derek Murcott
 Minotaur: Dave Prowse, Terry Walsh
 Guard: Melville Jones
 Face of Kronos: Ingrid Bower
 Baby Benton: Darren Plant
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Producer:  Barry Letts.
Script Editor: Terrence Dicks.
Writer: Robert Sloman (Robert Sloman, Barry Letts).
Director: Paul Bernard.
Designer: Tim Gleason. 
Costume: Barbara Lane.
Make up: Joan Barrett.
Visual Effects: Michaeljohn Harris (episodes 1-4, 6) and Peter Pegrum (episodes 5 & 6).
Music : Dudley Simpson.
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Novelized as "Doctor Who - The Time Monster"  by Terrence Dicks  (0 426 20221 X) first published by W. H. Allen (now Virgin Publishing Ltd.) in 1985 with cover by Andrew Skilleter.  Target library number 101.
Also released paired with "Doctor Who and the Daemons" as one of the Star Books "Doctor Who Classics" series in March 1989. (ISBN 0 352 32382 5). It was published simply by gluing the two individual books together with a new cover and opening page.

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Released in the Master Box Tin (with "Colony in Space") in the UK November 2001. (BBC Catalogue #7175). Photomontage cover. Release in Australia, New Zealand, US, & Canada still pending.

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The story features a new interior for the TARDIS.
Guest appearances are made by horror star Ingrid Pitt and David Prowse, who later played 'Darth Vader' and the more recognizable role of 'The Green Cross Code Man' in public service announcements.

All six episodes exist in color as PAL conversions from NTSC 2" color videotape recovered in Canada in 1979. 16mm black & white telerecordings of all six episodes also exist.

Ealing filming on Stage 2. (29-31 March; 3 April 1972)
Studio recording in TC3. (9-10 May 1972)
Studio recording in TC4. (23-26 April; 23-24 May 1972)
Swallowfield Park, Swallowfield, Berkshire. (4-5 April 1972)
Stratfield Saye Park, Stratfield Saye, Hampshire. (6 April 1972)
Roads near Stratfield Saye, Hampshire. (7 April 1972)
Mortimer Lane, Mortimer, Berkshire. (6 April 1972)
School Lane, Heckfield Heath, Hampshire. (6 April 1972)
Road near Old Church Farm, Hartley Witney, Hampshire. (7 April 1972)

Episode 1 - During the story, the Doctor gives JO a "TARDIS sniffer-outer". If you watch Jo's hand whenever it is "on" you can see her finger on a button turning it on and off.
Episode 1, 2 - The end of episode 1 has the shots in a different order to the reprise in episode 2, in order for it to end on the dramatic close-up of the Master shouting "Come, Kronos! Come!" However, this causes an amusing error – after the shot of Stuart Hyde clutching his head and reeling back from the crystal, in the next shot (the final shot of episode 1) he can be seen in the background still calmly leaning over the crystal, holding his clipboard.
Episode 2 - When JO rings the lab to say that Stuart is waking up, Benton answers the phone. He covers the mouthpiece of the phone with his hand while informing the Doctor, who says to tell JO that he and Ruth are on their way. When Benton goes to report this, JO says, "It's all right, I heard". But if Benton was covering the mouthpiece, how could she have heard?
Episode 2, 3 - When Krasis vanishes from Atlantis, summoned by the Master, the glowing crystal can still be seen in front of Hippias, who is watching. Yet in episode 3, Hippias tells King Dalios that Krasis and the crystal vanished together.
Episode 3 - As the Master summons Krasis, he tells Dr. Percival, "You watch that crystal!" The camera obligingly zooms in on the crystal, and we see that it is uncovered at this point. Immediately after Krasis has materialised, the very next shot reveals that the plastic cover has somehow replaced itself over the crystal.
Episode 3, 4 - The Master goes through all the rigmarole of trying to convince Krasis that the crystal is safe to touch, because (he says) he needs Krasis's help to carry the unit containing the crystal. But after making us suffer through all that horrible padding with the Doctor's stupid kitchen-utensil jamming thingy, the Master simply picks the unit up and carries it into the main lab himself! Then in episode 4, he carries it into his TARDIS, again by himself.
Episode 3 - Why does the UNIT vs. Roundheads battle last so long, and with no casualties?
Episode 3, 5 - In episode 3 when Dalios showed Hippias the entrance to the Minotaur's lair, the door opens outwards on the left-hand side. When JO is thrown into the lair by Krasis in episode 5, the door opens inwards on the right-hand side! You can look at the statue next to the door to confirm that the same scenery flat has been used as both the inside and outside of the labyrinth door.
Episode 4 -The stock V1 footage is on black-and-white film.
Episode 4- If the V1 was brought forward in time and exploded in the present day, how come the Comic Yokel remembers it exploding in 1944?
Episode 4 -Helping the soldiers to get the TARDIS upright, the Comic Yokel yells, "One, two, six, heave! One, two, six, heave!"
Episode 4 -When the Doctor supposedly talks "backwards", if you actually play what he says backwards, it's still gibberish.
Episode 5 -You can see the stick holding the TARDIS in the scene where the Master throws it into the time vortex.
Episode 4, 5 - In the high shot of the console room while JO is talking to the Doctor out in the vortex, there's a blatantly obvious white electrical cable running from the console across the floor and out through a gap between two of the walls. It can also be seen in the TARDIS scenes in episode 6 – in both the Doctor's and the Master's TARDIS.
Episode 6 - In her struggle to reach the Time Ram control, JO pushes the entire console of the Master's TARDIS out of position.