The Inquisitor (who was never named) played an important part in The Trial of A Time Lord, the story which spanned the whole fourteen episodes which comprised Season 22 of Doctor Who.

A stern Time Lady charged by the High Council of Gallifrey with weighing evidence against the Doctor for his alleged crimes, she allied herself with him over the the course of the story. At the end of the story, a revolution having occured on Gallifrey, the Doctor suggests that she would make an excellent Lady President before continuing on his travels.