Topic summary
The Sirens of Time
Extracted from the Wikipedia article Doctor Who: The Monthly Adventures.
Big Finish Productions began producing audio dramas featuring the Fifth Doctor, Sixth Doctor, and Seventh Doctors, under the "Main Range" banner, starting with the multi-Doctor story The Sirens of Time in July 1999. They gradually developed a pattern of thirteen releases per year, one every month with two in September or December. From 2001 to 2007, the main range also included releases featuring the Eighth Doctor; future releases with the Eighth Doctor were more sporadic, coincident with the beginning of the Eighth Doctor Adventures. Various companions appeared throughout the adventures in main and guest roles, mostly originating from television, though some originated from various spin-offs such as novels and comics, and some debuted in the Big Finish audios themselves.