Categorical Imperative (short story)

Summary
to be added

Characters

 * First 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

Continuity
to be added

Timeline

 * For the First Doctor: in between Frayed and Childhood Living