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|Big Finish Productions audio drama|
|Writer||Paul Cornell & Mike Maddox|
|Release date||January 2007|
Spring sees them become embroiled in Time Lord politics on an alien world ruled by intelligent but flightless birds, beings with an especially severe way of meting out justice.
- Zero — Hugh Fraser
- Hoodeye — Jamie Sandford
- Redklaw — Toby Longworth
- Carrion — Lois Baxter
- Snowfire — Teresa Gallagher
Summer has them avoiding the wrath of Sir Isaac Newton. The Doctor and Nyssa are arrested for possessing counterfeit coins; they are, in fact, genuine coins from Earth's future. One of them, an American Eisenhower silver dollar, depicts an eagle soaring over the lunar surface. Other coins hint at a future united Europe.
- Sir Isaac Newton — David Warner
- Guard — Jeremy James
- Jailer — Trevor Littledale
- Molly — Sunny Ormonde
Autumn has the Doctor settling down in an English village to play cricket while Nyssa tries her hand at writing a novel. Instead, she catches the attention of a local boy who pesters her about her unwritten book. Uneasily, Nyssa falls in love, and contemplates life on Earth, left behind by the Doctor, where she will age and face her own Autumn.
Winter sees the pair meet up years after their last encounter in the strangest of circumstances. Long after the events of Terminus, Nyssa has settled down with Lasarti and is now the mother of an infant daughter. Recurring psychic visions of the Doctor, and another figure who may either be her father or The Master, convince her to use a special machine to allow her to examine her dreams while conscious. Instead, she finds herself entering the Doctor's dream, one in which he's a normal man, a father and husband weathering a brutal winter, and not a traveller of time and space. The Doctor does not remember Nyssa, although he soon realizes that his understanding of his life is incomplete.