The Worlds of Big Finish

 was a 2015 audio anthology from Big Finish Productions. It was a crossover of several of their ranges, some related to Doctor Who and some not.

Publisher's summary
From the streets of Edwardian London to the corridors of a near-infinite library in the distant future, a single book holds the key to the fate of life on Earth.

Some believe it predicts our future – and the apocalypse - with unnerving accuracy. Others will stop at nothing to destroy it, and will chase it from one side of the universe to the other; from a country house in the Roaring Twenties to the casinos of Mars, and from 221B Baker Street to the terrifying desert world of Sisyphus IX...

Featuring Abby and Zara, Sherlock Holmes, Dorian Gray, Iris Wildthyme, Vienna Salvatori and Bernice Summerfield, The Worlds of Big Finish brings together some of Big Finish's best-loved characters in an adventure spanning thousands of years!

Cast

 * Bernice Summerfield - Lisa Bowerman
 * Sherlock Holmes - Nicholas Briggs
 * Zara - Laura Doddington
 * Abby - Ciara Janson
 * Iris Wildthyme - Katy Manning
 * Vienna Salvatori - Chase Masterson
 * Dorian Gray - Alexander Vlahos