Categorical Imperative (short story)

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

Characters

 * 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 Foreman
 * Peri

Continuity

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

Timeline
For the First Doctor:
 * This story occurs after ST: Indian Summer
 * This story occurs before DWY: Urrozdinee

For the Second Doctor:
 * This story occurs after to be added
 * This story occurs before to be added

For the Third Doctor:
 * This story occurs after PDA: The Wages of Sin
 * This story occurs before DWAN: The House That Jack Built

For the Fourth Doctor:
 * This story occurs after VD: The Duke of Dominoes
 * This story occurs before ST: Observer Effect

For the Fifth Doctor:
 * This story occurs after BFA: Excelis Dawns
 * This story occurs before ST: Rome

For the Sixth Doctor:
 * This story occurs after ST: Strange Attractor
 * This story occurs before Crisis in Space

For the Seventh Doctor:
 * This story occurs after ST: Closing the Account
 * This story occurs before DWY: Metamorphosis

For the Eighth Doctor:
 * This story occurs after ST: A Good Life
 * This story occurs before ST: Venus