Fyodor Nikolai Kerensky

was a minor character featured in the "City of Death" storyline from series seventeen of Doctor Who. Played by actor David Graham, he appeared in the first three parts of the story, with archival footage being incorporated into part four.

Biography
Doctor Kerensky was a Russian scientist who came to work in the service of the aristocrat Count Carlos Scarlioni. Kerensky had no idea that Scarlioni was actually a time-displaced alien from a race known as the Jagaroth. Scarlioni put Kerensky to work on a special project in the cellar of his home in Paris, France. He had him develop a cellular acceleration device. Scarlioni observed Kerensky's work, but the nervous scientist complained about the lack of funding for his experiments. Unimpressed with Kerensky's concerns, Scarlioni handed him one million francs, confident that it would be more than enough to allow him to continue his research.

Kerensky soon discovered that his laboratory had earned the attention of three unwelcome visitors: The Doctor, his companion Romana and a violent police inspector named Duggan.

The Doctor secretly observed Kerensky's work and watched him accelerate time by turning an egg into a chicken. He eventually made his presence known, surprising the nervous scientist. He told him that his work was interesting, but that it was also totally wrong. The Doctor went on to explain how he had created a different time continuum, but one that was completely incompatible with their own. As proof of the Doctor's words, the chicken's cellular structure continued to accelerate until it became nothing more than an aged skeleton. The Doctor made a small adjustment to the equipment, reversing the polarity and thus, reversing the effect. While the Doctor was busy analyzing the equipment, Duggan came out from behind a column and clobbered Kerensky across the back of the head, knocking him out.