One moment you're talking about the entire universe blowing up and the next you're going on about tea.
— The Brigadier, being 100% authoritative, can't take the Doctor's passive attitude in a grand crisis
The Master has a new alias - Professor Thascales (Greek for "Master" - you'd think the Doctor would have cottoned onto this by now), and he is about to switch on his wonderfully-named TOMTIT (Transmission Of Matter Through Interstitial Time) device. The device will give the Master control over Kronos, a "creature from outside time".
It works, but the Master can't control it, and runs away. The Doctor arrives and deactivates the machine, but the Master then switches it back on again, using it to first kidnap an Atlantean high priest and then to trap the UNIT forces in a time-freeze.
Travelling to Atlantis in his TARDIS, the Master hopes to steal the Kronos Crystal and with it gain control of Kronos. The Doctor follows with Jo, but the Master has already seduced Queen Galleia and staged a coup. However, the queen discovers that the Master is responsible for the King's death and turns against him.
The Master unleashes Kronos, destroying Atlantis and taking Jo captive in the process. Both TARDISes escape the destruction and the Doctor and the Master confront each other in the Time Vortex. The Doctor threatens to "Time Ram" the Master, destroying both ships, but can't bring himself to do it. Jo can, though, and presses the button on the Master's TARDIS console. The ram, however, releases Kronos, who rescues the Doctor and decides to punish the Master with eternal torment. The Doctor pleads for the Master and Kronos agrees to release him... only for the Master to take the opportunity to flee instead.
- A Fate Worse Than Death: The reason the Doctor refused to let Kronos punish the Master. This is also because he sympathizes with a person who used to be his old friend. But fast-forward eight incarnations and you'll see the Doctor's merciful nature has contracted- he is willing to give people a fate worse than death, thanks to one Time War and a lot of breaking done to his psyche.
- Always Save the Girl: The Master calls the Doctor's bluff about Time Ram, based on this principle.
- Anachronism Stew: The Master invokes this by sending an armored knight and a group of roundheads at the TARDIS convoy.
- Applied Phlebotinum
- Blessed with Suck: Atlantis, last time Kronos paid a call.
- Blue and Orange Morality: Kronos.
- Bullfight Boss: The Doctor fights the Minotaur with a combination of bullfight techniques and Venusian karate.
- Butt Monkey: Sgt. Benton falls for the oldest trick in the book and is de-aged into a baby. He shrinks out of his clothes and ends up in a makeshift diaper being spoon-fed. Then he gets returned to his original age and finds himself confused and very naked in front of the lab scientists and his UNIT colleagues.
- Continuity Nod: The Doctor once again goes on about grey, grey things, which bore him. In "The Mutants", it was 30th century over-polluted Earth cities. This time, it's rocks.
- Cool Car: Bessie has to qualify. An Edwardian roadster with a overdrive that allows the Doctor to drive it at 200 mph, with brakes that absorb inertia allowing the car to stop in about two seconds flat without throwing the Doctor and Jo through the windshield. Awesome.
- Conveniently Coherent Thoughts: Somewhat subverted - when making telepathic contact with Jo Grant, at first she hears a cacophony of voices. But the Doctor gets her to concentrate on the "main" one and we get a clear conversation about how to save the day.
- Deadpan Snarker: Dalios, particularly after The Master tries to mesmerize him.
- Everybody Laughs Ending
- Evil Is Not a Toy
- Fanservice: Check out the cleavage. Also Jo in yellow go-go boots.
- Hippias: a young, good-looking Atlantean man who wears eyeliner and walks around shirtless and in a skirt with a split up to his hip.
- Fountain of Youth: Poor Sgt. Benton
- Fun with Acronyms: TOMTIT.
- God Guise: Averted when the Atlantian king sees right through the Master.
- Hey, It's That Guy!: David Prowse, who would later play Darth Vader, as the Minotaur.
- Humiliation Conga: The Master's God Guise fails, the king laughs off his attempt to hypnotise him, he's arrested by guards and led off only to encounter Jo and the Doctor whom he last saw in his inescapable Death Trap — making the Master so speechless with fury Jo has to provide his dialogue. "How about: Curses! Foiled again!"
- Kung-Fu Proof Mook: The Master tries his favorite line on the 500-year-old King of Atlantis - who laughs at him.
- Literal Genie: Kronos lets the Master go when the Doctor asks for it, but doesn't seem to understand he wasn't supposed to escape.
- A Load of Bull: With Atlantis being based on Minoan culture, of course the Minotaur had to appear.
- Look Behind You: "You see, Sergeant, the whole point is - Doctor! What a very timely -" (punch) "You're wrong, Sergeant Benton. THAT is the oldest trick in the book!"
- MacGyvering: The Doctor makes a time jammer out of kitchenware, a wine bottle and a cup of tea.
- Made of Indestructium: Both the TARDIS and Kronos' crystal.
- The Master
- Meaningful Name: Thascalos
- Naked on Revival: Benton is brought back to his normal age — but has no clothes. Cue Everybody Laughs Ending.
- No Ontological Inertia: Averted. Turning off the machine does nothing to unstick the Brigadier et al., Stu remains aged until he is restored by a second time disturbance, etc.
- No Sell: The Master's hypnosis doesn't work on King Dalios.
- Out-of-Character Alert: the Master impersonates the Brigadier in a telephone call to Sergeant Benton. He imitates his voice perfectly but Benton is not fooled because brigadiers don't call sergeants "my dear fellow".
- Overnight Age-Up
- Old King Hot Wife: No wonder she tossed him over for the Evil Is Sexy Master!
- Really 700 Years Old: The King of Atlantis is at least 500 years old.
- Rebuilt Set: This story introduced a completely new TARDIS console room set (used for both the Doctor's and the Master's). Unfortunately it was universally hated at the time and damaged in storage (which may possibly have been related to the hatred), so never used again.
- Reverse the Polarity: Ruth and her assistant try to release the folks frozen in time by turning part of the TOMTIT device upside-down. It doesn't work although it does de-age Sgt. Benton into an infant.
- Spot of Tea: Not just the page quote - it also proves the key missing ingredient in the temporal jammer.
- Straw Feminist: Who ironically is one of the serial's more sensible characters.
- This Is My Name on Foreign: Thascales, being Greek for Master.
- Time Stands Still: TOMTIT makes time stand still in an area around the apparatus.
- Totally Radical: Jo calls a few things 'groovy'.
- Vulnerable Convoy: It's attacked by a knight, a group of roundheads and a bomber plane. The TARDIS it was protecting emerges unharmed, though.
- When Things Spin, Science Happens: The jamming device that the Doctor builds.