The Seventh Doctor worked with a 21st century girl to bring down Perseus.
The girl entered a contest in 2040 to build a working android, to be judged by the President. Perseus had their own entry, but the girl's android, named Anteus, appeared to be superior. The Doctor, in front of the crowd, angrily denounced Anteus as dangerous, but when he couldn't convince the girl, he offered to buy it. He and the Perseus representative began a bidding war, in which the Perseus man won. At that point, Chris Cwej realised the Doctor and the girl had been working together. (PROSE: Anteus)