Ali (The Beast of Babylon)

Ali was a Karkinian and brief companion of the Ninth Doctor.

She first met the Doctor at a family picnic when a Starman attacked those nearby. Ali pocketed a silver orb which was left behind after the Starman left the area.

Ali attended school through college. Over the course of her education she learned in science that TARDISes were theoretically possible and in ancient history she was told that Time Lords were extinct. Although she considered technology "ridiculously retro," she was proficient in using it.

Years later, as a teenager still attending college, Ali met the Doctor again and accompanied him as he hunted the Starman to Babylon in Earth's ancient history.

The Doctor and Ali defeated the Starman, and the Doctor took her back home to Karkinos. On Karkinos, Ali persuaded the Doctor to go back to Rose Tyler, a human he had met shortly before he first met her.

After a period of time, the Doctor came back for Ali, with "the hounds of hell on his heels." (PROSE: The Beast of Babylon)