She shouldn't be here.

It feels unnatural. It's a ship that travels through space, but there are no windows and no stars for her to watch.

The others, Ian and Barbara, accept this. They don't understand space travel. They don't understand that it shouldn't be so safe, so easy; wrapped in warm white lights and the Doctor's strange wisdom.

Invaders in infinity; she's seen death when the reminders of danger are obvious. How much more difficult in this TARDIS. And how she wishes for the freedom of a world where her survival is met only by the chances of nature.