Categorical Imperative (short story)

Categorical Imperative was the seventh short story in the Short Trips anthology Short Trips: Monsters. It was written by Simon Guerrier. It featured the First Doctor, Second Doctor, Third Doctor, Fourth Doctor, Fifth Doctor, Sixth Doctor, Seventh Doctor, Eighth Doctor, Sarah Jane Smith, Ace, Charley Pollard, Jamie McCrimmon, Jo Grant, Susan, Peri, Turlough and Tegan.

Summary
The Fourth Doctor and Sarah Jane go to a christening and are surprised to see the Third Doctor there too.

Characters

 * Fourth Doctor
 * Sarah Jane Smith
 * First Doctor
 * Susan Foreman
 * Third Doctor
 * Jo Grant
 * Sixth Doctor
 * Peri
 * Seventh Doctor
 * Ace
 * Eighth Doctor
 * Charley Pollard
 * Fifth Doctor
 * Tegan Jovanka
 * Second Doctor
 * Jamie McCrimmon
 * Ann

Continuity

 * Sarah Jane recalls encountering radiation poisoning on Skaro. (TV: Genesis of the Daleks)