Vienna makes her first appearance in the upcoming Doctor Who full cast audiobook The Shadow Heart, which stars Sylvester McCoy as the Seventh Doctor (he played the role on TV between 1987 to 1989, and reprised it in the TV Movie in 1996).

Titled simply Vienna, the new series launches with a pilot episode in February 2013 called The Memory Box, in which Vienna is on the run from the law, standing accused of murdering a rich industrialist – a crime she may or may not have committed. But is anything quite what it seems?

“In Vienna, Jonathan Morris has created a character who is smart, sexy and a great deal of fun,” says co-producer David Richardson. “And Chase just exudes charisma and star quality. When the two came together during the recording of The Shadow Heart, it soon became clear that we had something wonderful.

“The script for The Memory Box is outstanding, and it’s our hope that the audience will embrace Vienna and a series will follow."

Chase Masterson says: "The Memory Box is a great romp. As with The Shadow Heart, writer Jonathan Morris takes us on a ride packed with twists and turns and farce - it's big fun.

“And Vienna is one of my favourite characters ever: the endearingly incorrigible killer we loved to hate in The Shadow Heart - completely unapologetic, even charming about her day job as a mercenary assassin. Plus, she usually manages to land on the side of justice. Vienna's quite a turn-on - I think you'll like her as much as I do."

Vienna: The Memory Box is co-produced by Mark Wright, directed by Ken Bentley, with sound design and music by Jamie Robertson. Executive producers are Nicholas Briggs and Jason Haigh-Ellery. The first episode is available at a special low introductory price of £5 for both CD and download. It will increase to full price a month after release, so pre-order your copy now!