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.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. Can be found restored with animation - albeit, unauthorized - here.
— Marc Cory
This episode/story provides examples of:
- 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.
- 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
- Lower-Deck Episode
- Mauve Shirt: Marc Cory.
- 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".
- Taken 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!
- The Virus: Varga plants.