Synopsis: The Doctor, Jamie and Victoria land in the middle of a dense jungle. Walking through it, they are attacked by vicious plants. They barely escape into the company of fairly primitive humanoids.
These people tell the TARDIS crew that they have been having a problem eking out a living because they cannot plant crops. Every time they make the attempt, they are attacked by some members of the native vegetation. Because the humanoids are vegetarians, these aggressive plants, or "Kraals", are effectively starving the humanoids out of existence.
When the Doctor discovers that the planet has no winter, he surmises that the vegetarians have not yet learnt how to make fire.
Testing a theory, he applies a torch to a Kraal, and, having never encountered fire either, it withers in fear.
Victoria suggests that the Doctor cannot hope to defeat the Kraals with just the one torch. He agrees, but then shares the secret of fire with the rest of the humanoids. Now armed with fire, the Doctor leads them to burn the Kraals out of existence. This will, he says, free up the land, allowing the people to farm.
Having solved the Kraal problem, the Doctor and his crew get back in the TARDIS and leave. In the last planet, he muses over whether he's made the right choice, given Earth's checkered history with fire.
Notes: This story's text mistakenly calls the female companion, "Polly". It's actually Victoria—but you'd only know that by the clothes.
Editorial comment: It's hard to imagine the Doctor, and especially the Second Doctor, behaving in this manner. He outright advocates genocide of the Kraals. The moral lesson to be drawn from the story is that if another group is causing you grief, it's okay to wipe them out completely.
Synopsis: The Doctor discovers a way to have the TARDIS materialize at the sub-atomic level. He, Jamie and Victoria end up inside a single uranium atom on Earth.
There they discover that there's a whole universe unto itself. They meet an apparently humanoid being who tells of great civilizations in this universe, but of unexplained catastrophes which consume whole worlds.
Working it through, the Doctor surmises that recent use of nuclear power has meant the fracturing of uranium atoms, and thus the destruction of whole, yet (to us) microscopic universes. Victoria implores the Doctor to try to find a way to stop humans from using nuclear power, so as to spare the billions of lives destroyed each time a single uranium atom is split. The Doctor laments that he'd be laughed out of any serious scientist's laboratory if he were to suggest such a thing. He goes on to say that our own universe may well be similarly microscopic to someone else. The Doctor says the situation is "hopeless".
The happy ending to this dire problem, if there is one, lies in the fact that the scientists living in that atom have discovered a way to shield themselves from the destructive power of nuclear fission. They can place individuals within an especially strong force field, which resists even the explosive power of an atom splitting. Fittingly, the shape of that force field is that of a teardrop.
Notes: Editorial comment:
This story is so bizarre, it makes Grant Morrison look like an advocate for tougher drug control policies.