1981 (production)


 * 28 January - Production of Logopolis concluded, bringing an end to the Tom Baker era.
 * April - John Nathan-Turner wrote a story outline for the proposed K9 and Company spin-off pilot story.
 * 13 April - Studio taping began on Four to Doomsday, the first story of the Peter Davison era to be made, though not the first to be broadcast.
 * May - John Nathan-Turner and Anthony Root composed a "format document" for a planned spin-off series to be entitled K9 and Company.
 * 12 May - Elisabeth Sladen was officially invited to reprise the role of Sarah Jane Smith for the planned K9 and Company spin-off.
 * November - Production of the pilot episode of the planned K9 and Company spin-off series, A Girl's Best Friend, took place.