Circular Time (audio anthology)

 was a 2007 Big Finish anthological audio release featuring the Fifth Doctor and Nyssa. It was the company's first attempt at audio anthology in the Big Finish Doctor Who audio stories|main monthly range (audio story). Its critical and popular success paved the way for the release's then-unique format to be repeated annually.

The release contained four separate short stories, including:
 * Spring by Mike Maddox from a story by Paul Cornell
 * Summer by Mike Maddox from an idea by Paul Cornell
 * Autumn by Paul Cornell
 * Winter by Paul Cornell

The theme of the compilation, as suggested by the title, was the passage of time — specifically the time of the relationship between Nyssa and the Doctor. A story was taken from each of the major periods of their relationship's life —spring, summer, autumn and winter — to indicate how it matured. Each story was also of a different genre — adventure with aliens on a distant planet, celebrity historical, character piece, and high-concept adventure. Despite the presence of a cohesive theme, however, the stories shared no narrative continuity at all.

Continuity
to be added