Doctor Who: 20 Things You Didn't Know About The Day Of The Doctor
11. The Origins Of Osgood
Petronella Osgood made her debut in The Day of the Doctor. Played by Ingrid Oliver and complete with a Tom Baker scarf, the character was essentially a Doctor Who fangirl who just so happened to work for UNIT.
Long-time Whovians might remember the character of Sergeant Osgood in the Third Doctor serial The Daemons, and the fact that the two characters share a name is no coincidence.
Steven Moffat originally planned for Petronella to be the daughter of Sergeant Osgood, but ultimately decided against explicitly stating this in the episode.
Following the popularity of Petronella, Sergeant Osgood has been included more in Titan Comics stories, where he often shares characteristics with his daughter - including using an inhaler.
Hopefully he's not just a really badly copied Zygon clone!