I'll tell you this: there's something very big going on here, and if the Daleks are involved, you can bet your life our whole galaxy is in danger.The one where a man becomes a killer cotton ball.A Lower-Deck Episode. A bottom deck episode, in fact. The Time Travel Team and TARDIS don't even appear at all - this is just a teaser for the later story "The Daleks' Master Plan".Three dudes, one of whom is a security agent for the Second Great and Bountiful Human Empire, crash in a jungle. They discover a Dalek plot to take over the solar system, and all end up very dead. Shades of James Bond abound.An animated reconstruction exists, made by fan animators, and partly funded by well-known 80s superfan Ian Levine.
— Marc Cory
This episode/story provides examples of:
- Absentee Actor: The Doctor and his companions don't appear at all.
- Backdoor Pilot: After "Planet Of Giants" was shortened and a hole in the schedule was created, Terry Nation wrote this episode partially as a teaser for the upcoming "The Daleks' Master Plan" and partially to see if a Dalek spinoff show could work. (It could, but not until much later and in some entirely different media.)
- The Bad Guy Wins: Cory never stood a chance.
- Body Horror: The Varga plants. Used as watchdogs by the Daleks, these are giant ambulatory cacti with at least a basic animal-like intelligence. They hunt animals - any animals, including humans - and then shoot their spines into them. These spines carry a venom with unusual effects: the victim first becomes paranoid and psychotic, obsessed with killing; then, they transform into Varga Plants themselves. Even killing the host body does not arrest the transformation. Brrrrr.
- Bottle Episode: It was written hastily when "Planet of Giants" was judged to be too long and edited down to three episodes rather than the planned four. It uses three sets (a human spaceship, the Dalek War Room and a jungle) all built for and recycled in "The Daleks' Master Plan", a couple of Daleks, a couple of very low budget monster suits made of glue and fluff representing Plant Aliens (which also get reused in "The Daleks' Master Plan"), a bunch of rather better-looking aliens on the Dalek ship (also reused in "The Daleks' Master Plan") and a spot of cheap Gorn. There is no Doctor, no companions, and the majority of the episode takes place with two actors arguing in the jungle.
- Chromosome Casting: There are no female characters whatsoever. Just men, male aliens and Daleks. (Except maybe Sentreal. We're not quite sure what Sentreal is).
- Exactly What It Says on the Tin: The episode's alternate title in production was "Dalek Cutaway", which tells you exactly what you're getting. This alternate title was often listed along with or in place of "Mission To The Unknown" as the title of the episode for years until some of the disputed episode titles were standardised.
- Expy: Terry Nation devised Marc Cory as "a space-age James Bond".
- Kill 'em All: Everyone dies except the Dalek and the mysterious council of aliens (all of which die in "The Daleks' Master Plan" later). Everyone means everyone - the Doctor and his companions don't show up in this episode at all, and so are spared.
- Lower-Deck Episode
- Mauve Shirt: Marc Cory.
- Out-of-Genre Experience: This is a one-parter (at a time when serials were the norm) Bottle Episode which is still unique in not having either the Doctor or any of the companions in it - it's a kind of extreme Lower-Deck Episode with just victims and Daleks. This had a reason behind it.
- Plant Aliens: The Varga plants — homicidal mobile plants which infect people, first making them turn into homicidal maniacs, and then into Varga plants. And they are native to Skaro, which suggests that they might be another of Davros' projects.
- Poorly Disguised Pilot: Terry Nation wrote this episode partially as an attempt to develop and sell the idea of a Dalek television series divorced from the larger Doctor Who universe. The proposed series would have followed the adventures of the Space Security Service, an elite organisation tasked with hunting Daleks.
- Red Shirt: The other two guys.
- Sequel Hook: For "The Daleks' Master Plan".
- Sliding Scale of Anthropomorphism: The delegates provide some nice examples. Two are Human Aliens, three are Rubber-Forehead Aliens, and Sentreal is a Starfish Alien.
- Took a Level in Badass: The Daleks, and the whole point of this story. After 3 defeats at the hands of the Doctor and a failed attempt at playing the Daleks for laughs in their last outing how do you make the Daleks scary again? Put them up against James Bond and have Bond lose!
- Transflormation: Varga Plants, the thorns of which contain poison that transforms victims into other Varga Plants.
- The Virus: Varga plants.