- Alternative Character Interpretation: Were the Mysterons genuinely benevolent beings turned bad by a reckless attack by Spectrum, or were they always chaotic murderers who merely viewed themselves as benevolent? We naturally don't see much of their activity besides their war on mankind, so don't know if they are any more pleasant off the clock, and on at least one occasion that Spectrum tried to make amends, they merely used it as an excuse for another attack.
- Awesome Music: Every single song in the entire original series. No exceptions. It's Barry Freaking Gray (the John Williams of his time), what did you expect?
- Ear Worm: The theme tune.
- Eldritch Abomination: The Mysterons could potentially be a flavour of this, though it depends on how you interpret them.
- Fridge Logic: How do the SPECTRUM hat radio microphones know to drop down when their wearers are about to use them?
- Memetic Badass: Captain Scarlet. Shot? Doesn't kill him. Blown up? Doesn't kill him. Any other sort of thing that would normally hurt a real-life human being? Doesn't kill him.
- Moral Event Horizon: There are two candidates for The Mysterons:
- Either when they attempted to destroy Cloudbase even though Spectrum had attempted to make peace with them.
- Or in the second episode where they made a plane (That was likely full of innocent people) crash so they could use said plane in an attempt to assassinate The Director General Of The Asian Republic.
- Most Wonderful Sound: Bom-Bom-Bom-Bo-Bo-Bo-Bom!
- Tear Jerker: Though it turns out to be All Just a Dream the episode "Attack on Cloudbase" counts.
- Lieutenant Green's reaction to Rhapsody's death is especially heartbreaking. Trying to contact Rhapsody, sounding like he's about to cry.
- The backstories of some of the characters are rather tragic. For example, Captain Black lost his parents in a nuclear war and ended up being raised by relatives who, in spite of providing him with a decent home, were emotionally neglectful towards him.
- Uncanny Valley: The puppets falls into this now and again. Gerry Anderson himself noted this, and found it to be something of an uncomfortable point between realistic enough, and seemingly trying too hard to imitate human movements.
- What Do You Mean, It's for Kids?: The series is perhaps the darkest of Gerry Anderson's series, with a large bodycount (for a series of its kind) in each episode, occasionally reaching double-digits; possibly triple-digits in a few episodes. Many of these deaths tend to be rather gruesome, too, and oftentimes show deaths in full gruesome detail. Hell, the first episode alone featured Captain Brown being used by the Mysterons as a suicide bomber.
YMMV / Captain Scarlet and the Mysterons