Summer (audio story)

 was a 2007 Big Finish Productions full-cast audio short story featuring the Fifth Doctor and Nyssa. It dealt with the problems that arose from the Doctor carrying anachronistic money around in his pockets during the time that Sir Isaac Newton was trying to catch counterfeiters in late 17th century England.

Publisher's summary
During the stifling heat of a summer past the Doctor and Nyssa suffer the vengeful wrath of Isaac Newton.

Plot
to be added

Cast

 * The Doctor - Peter Davison
 * Nyssa - Sarah Sutton
 * Guard - Jeremy James
 * Molly - Sunny Ormonde
 * Jailer - Trevor Littledale
 * Sir Isaac Newton - David Warner

Continuity

 * The Doctor expresses interest in visiting the Council of Nicaea one day, which he would later do in the company of Peri Brown and Erimem. (BFA: The Council of Nicaea)
 * The Doctor quotes a few lyrics from Who is the Doctor.
 * While imprisoned, the Doctor laments that he has not found the time to make a new sonic screwdriver since the original's destruction by the Terileptil leader in 1666. (DW: The Visitation) The Seventh Doctor would eventually make a replacement sonic screwdriver at some point prior to the events of DW: Doctor Who (1996).
 * The Sixth Doctor would later be imprisoned in the Tower of London on two separate occasions in 1590 and 1554 (BFA: Point of Entry, BFA: The Marian Conspiracy), whereas the Eleventh Doctor would suffer the same fate in the 17th century but managed to escape with an "invisible sphere" (DW: The Impossible Astronaut).
 * Isaac Newton mentions that his nose bled for three days after the apple fell on his head. The Fourth Doctor once claimed that he sat in Newton's tree dropping apples on his head and then explained gravity to him over dinner. (DW: The Pirate Planet)
 * The Tenth Doctor claimed that he had once taken Newton on a trip to Practas Seven, but he seemingly did not take the experience of travelling through time and space very well as he "sat in a corner and whimpered." (IDW: Final Sacrifice)

Timeline
As with all Fifth Doctor/Nyssa stories, this one broadly occurs between DW: Time-Flight and Arc of Infinity. More specific placement is fairly arbitrary. One possibility, amongst others, is that it happens after BFA: The Game and before ST: Greenaway.

This was the second in a series of stories named after seasons.
 * This story occurs after BFA: Spring
 * This story occurs before BFA: Autumn