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Osgood is a scientist who worked for UNIT, acting in a capacity of a personal assistant to Kate Stewart, in the early 21st century. Her first name is (apparently) Petronella when pressed to give it, though the Twelfth Doctor admitted Osgood was a better name.
An admirer of the Doctor, she met the Time Lord on three occasions. The first was the infiltration of UNIT by Zygon invaders, which was resolved by the Eleventh Doctor joined by the Tenth and War Doctors. The second time was with the Twelfth Doctor during an invasion of Earth by an army of Cybermen led by Missy, who murdered Osgood. Her Zygon double and herself recorded a video explaining the Osgood Box before she died. In fact it was unclear which of the Osgoods had died as the surviving Osgood was unwilling to reveal the information. With the Doctor's help UNIT was able to convince a group of radical Zygons from breaking the cease fire with humanity and revealing all Earth dwelling Zygons. This resulted in the leading Zygon adopting the form of Osgood, once again meaning that there were two Osgoods to oversee the peace.
Prior to her first encounter with the Eleventh Doctor, Osgood was involved in stopping an attempted Auton Invasion of Earth via Delvin Futuretech, travelling the Gobi Desert to search for a Nestene Energy Unit with Lt. Sam Bishop.
- Her in-game appearance shares the same scarf piece as with the Fourth Doctor.
- In fact, in the TV show, she bases parts of her outfit on the Doctor's previous outfits. Her Zygon counterpart did as well, but their outfits were different.
- She appears with Kate Stewart as one of the hostages in the Rude Awakening Quest.