Zoe: Oh, this is going to be fun. I shall learn a lot from you.
The one with gyrating Cybermen.
The Doctor and Jamie arrive on a spaceship and are attacked by a servo robot. Contacting a nearby space station, simply known as "the Wheel", they are rescued, but needless to say, more peril awaits.
The spaceship also releases some Cybermats which travel to the station and begin to prepare for an attack by the Cybermen. Meanwhile the Doctor and Jamie meet the crew, including a young teenage mathematical genius called Zoe Heriot. Most of the rest of the crew are being hypnotically controlled by the Cybermats, and the Doctor sends Jamie and Zoe to fetch a piece of phlebotinum from the TARDIS which will allow him to beef up the station's laser enough to destroy the approaching cyber-fleet.
Zoe stows away on the TARDIS, but is discovered by the Doctor who asks if she really wants to come with them, and shows a clip of a previous adventure to demonstrate the dangers. She still seems keen, so they agree to let her come along.
The first ten minutes of it were reconstructed in (colour) animation in 2018, as an audition piece for the animators of "The Macra Terror", and can be found on that DVD.
- Absentee Actor: The Doctor is absent from the second episode in order to give Patrick Troughton a holiday.
- Action Figure Speech: The Cybermen indicate they are speaking by rocking their entire upper bodies back and forth. Their air of menace rather suffers as a result.
- Auto-Kitchen: The spaceship that the Doctor and Jamie spend Episode 1 on has one.
- Bigger on the Inside: The Doctor removes the component that allows the TARDIS to be dimensionally transcendental, so the inside reverts to a simple police box interior.
- Broken Aesop: The Doctor's "Logic, my dear Zoe..." line is intended to show that Zoe is too sure of herself, and logic won't necessarily lead one to the right answer. The problem is that her reasoning isn't wrong, and logic has led her to the right answer: the Silver Carrier's arrival was not an accident.
- Call-Back: The need for mercury to fix the TARDIS was also the reasoning used by the First Doctor to explore the Dalek city on Skaro.
- Complexity Addiction: So, the Cybermen's plan: Capture the Silver Carrier and have the Servo-Robot pilot it towards the Wheel. When nearby, it releases tiny pods across space that go into the Wheel and hatch Cybermats. The Cybermats then consume the Wheel's stocks of bernalium. Meanwhile, the Cybermen ionise a star to (somehow) divert an asteroid storm towards the Wheel. The crew of the Wheel will notice this, but be unable to use their defensive laser without bernalium. They will then discover that the Silver Carrier has plenty of bernalium on board, so will go over to get it. Concealed in the bernalium are large egg-like pods which, when on the Wheel, will hatch Cybermen. These Cybermen will then deactivate the Wheel's oxygen supply, killing the crew. The Cybermen will then be able to use the Wheel as a beacon for their fleet. All of which raises the question: if they want a beacon, why not just build one?
- Custom Uniform: Zoe's jumpsuit is a different design from the other characters'.
- Dies Wide Open: How Jamie and Zoe find the body of Gemma Corwyn.
- Early Installment Weirdness: The Doctor offers Jamie a lemon sherbert rather than a jelly baby.
- Emotionless Girl: Zoe, in her first couple of episodes.
- Establishing Character Moment: Zoe's first scene has her relay instructions from her boss, only to be distracted by a mathematical problem she is completing in her head, establishing her as a human calculator.
- Fake Shemp: A double plays the unconscious Doctor in the second episode. Similarly, Anne Ridler was not hired for episode six so the dead Gemma Corwyn is represented by a double and photographs of Ridler are used for close-ups of Corwyn's body.
- Food Pills: The Doctor and Jamie, exploring a deserted spaceship, discovers a machine that dispenses cube-shaped food pills.
- Freak Out: Jarvis Bennett is the latest in a series of base officers to go nuts during this season.
- Freudian Slip: "We're all going to be killed shortly unless you switch over to sexual air supply" note
- Heroic Sacrifice: Gemma Corwyn
- Line-of-Sight Alias: Jamie coins the long-running "John Smith" alias for the Doctor from a piece of medical equipment.
- Mathematician's Answer:Zoe: This Doctor friend of yours. Is he a scientist?
Jamie: He is in a way I suppose, yes.
Zoe: What's his speciality?
Jamie: His what?
Zoe: Well, is he a physicist, biochemist, astronomer, biometrician?
Jamie: Yes, he is.
- Meaningful Name: The Cybermen are often referred to in titles by the word silver (the Silver Menace, Nightmare in Silver, the Silver Turk, and so forth). So what's the name of the spaceship they use to Trojan Horse their way aboard the Wheel? The Silver Carrier, of course.
- Retirony: Zig-zagged with Flannigan. He's attacked almost immediately after declaring he's eager for a year's leave back on Earth, but manages to fight and even kill one of his attackers. He's then subjected to Cyberman control. Later he's the first to be removed from Cyberman control, ultimately subverting the trope.
- Sci-Fi Writers Have No Sense of Scale: The Cybermen's plan requires meteor showers — which they cause by blowing up distant stars.
- Space Clothes: Zoe's catsuits are fondly remembered by fandom.
- Tainted Veins
- Tin-Can Robot: The servo robot in episode 1.
- What the Hell Is That Accent?: It's not noticeable in the existing episode, but Laleham provides another in a long line of godawful American accents—this time a "Southern" one.
- Zeerust: Never mind Rose, Zoe was actually the first 21st century companion. A different, much groovier 21st century, featuring Space Clothes, Raygun Gothic, and Food Pills. Zoe probably played with jetpacks when she was a kid, it's just not mentioned...