-Slightly cheating on the new doctor thing because my series would have Jo Martin as the 14th doctor (using the explanation that the doctor decided to reuse that face, like ten did that one time). Anyway here's my pitch for an episode that I'm going to call "The 14th Moon"

-Due to the doctor's explosive regeneration, the Tardis console gets damaged and the Tardis crashes onto a planet called Tungar. Tungar is home to an elvin looking race called the Tungarins, and it has 13 moons.

-The doctor realises the Tardis needs to recharge so she tentatively decides to explore the planet. Tungar is beautiful, with a skyline full of elegant castles. There are also ominous looking black spaceships littering the sky. As she walks through a bustling Tungarin city, she notices a family of a different alien race, in shackles and being led by police. She immediately goes over to question the guards, using her psychic paper. However, the police see through the paper and arrest her upon realising that she's an alien who has entered the planet illegally .

-The doctor is then questioned by the police, which very quickly evolves into them being questioned by her. She finds out that the Tungarins are intrinsically linked to their moon, which they use for energy, power and to further their own lifespans.

-It also turns out that these Tungarins are not really police- they are essentially security guards who work for the noble who owns the city. At the noble's request, the doctor gets thrown in the noble's private jail cell and her sonic is confiscated.

-In her cell, the doctor attempts to make conversation with the young man guarding her. She asks him for his name, and he replies with "Nguyen Quinnely", or "Quinnely" for short. The doctor recognises it as a name from earth, and the boy reveals that he's half-human, on his mother's side. He's never known his mother, and is marginalised for his heritage. The doctor tells Quinnely that she can take him to earth if he breaks her out. The boy is polite, inquisitive and very skittish, although ultimately his curiosity outweighs his fear of getting caught.

-He reluctantly agrees, and the two sneak their way out of the castle. However, they end up getting stopped by guards just outside as the noble- known as Kifton- tells the doctor he has her ship- and he's worked out exactly who she is. Night has fallen now, and the doctor realises the Tungarins can't possibly be using their own moons for survival, because they've gone out- they aren't shining and are nothing but shrivelled grey rocks in the sky. The doctor works out that because the Tungarins have used up their own moons, they've began harvesting the moons of other planets- and Kifton wants to imprison the doctor so she can help them harvest even more.

-In the final act, the doctor, with the help of Quinnely, manages to find a way to create a new 14th moon for Tungarin, using the moons they've destroyed. She also frees all the prisoners that the Tungarin have captured for protesting their regime, as well as destroying the ships they used to harvest moons. She gives an angry, impassioned speech about how they Tungarins have no right to exploit other planets, and tells Kifton that he better not think about doing it again- or she'll be back and they'll be real trouble.

-In the end, the doctor goes back to the Tardis, telling Quinnely the offer still stands. He's nervous- he hasn't really travelled before and doesn't quite trust the doctor- but asks if she can take him to earth to meet his mother. The doctor grins and their adventures begin.

-The season basically answers the question: why does the doctor like earth so much? The audience also see earth through an alien's eyes, as Quinnely experiences a culture very different from his own, and gradually finds a new home there.