True Nemesis (audio story)

 was the fourth and final story in the audio anthology Masters of Time, produced by Big Finish Productions. It was written by Andrew Smith and featured Jemma Redgrave as Kate Stewart, Ingrid Oliver as Petronella Osgood, James Joyce as Josh Carter, Chris Lew Kum Hoi as Jimmy Tan, Christopher Naylor as Harry Sullivan, Eleanor Crooks as Naomi Cross and Michelle Gomez as.

Publisher's summary
Under ’s guiding hand, the Vulpreen are ready to strike out, to establish themselves as the new Masters of Time. UNIT's confrontation with Missy in the depths of Portugal's Douro Valley will decide the fate of not just the Earth but the whole Universe.

Plot
On a planet in the Andromeda galaxy, Missy holds Harry and Naomi in a stasis chamber and uses them as leverage to force Kate and Josh to disarm. She activates a biomagnetic field with her umbrella to restrain the two of them and claims that she intends to save the universe from the time glitches, caused by the Vulpreen's escape from the Void World. Before then, however, she plans to take control of the Vulpreen and use them to conquer the universe. Kate attracts the planet's carnivores with her blood to distract Missy, allowing her and Josh to escape through an Arch.

Osgood and Jimmy arrive in the Douro Valley and find that the area is full of hypnotised people and a Vulpreen army. They meet Hugo, a guide who hopes to save his wife and daughter, and go with him to a shelter before heading to Missy's villa where Kate has been recaptured by her and Varliss. Osgood runs into Josh and sends him and Jimmy to save Kate from Varliss whilst she and Hugo go to save Harry and Naomi from Missy, sneaking into her secret laboratory where she has been experimenting on Vulpreen to find their genetic code. Exploiting this genetic code, Missy kills Crastor through temporal obliteration.

Kate, Josh and Jimmy capture Varliss and take his flier, destroying a Super Arch before the flier is aged by an unusual storm and crashes. Varliss escapes and Osgood contacts Kate from the Andromeda galaxy, where she has saved Harry and Naomi and is holding Missy captive, and explains how Missy intends to kill the Vulpreen using the Super Arches and replace them with a race such as the Sontarans or Cybermen. Osgood shuts down Missy's systems to unleash the time storms upon the Vulpreen, prompting Varliss to send his people through the Super Arches which she has redirected to send them into no-space and no-time. Varliss is one of the few Vulpreen remaining on Earth and Kate invites him to talk with her.

Varliss rescues Missy in his ship and claims that he will destroy Earth with neutron torpedoes, but he reveals that he knows of Missy's deception and how she murdered Crastor and flies through a Super Arch to get his revenge on her. UNIT head back to the United Kingdom to use the Vulpreen control centres to remove the time bubbles and, some time later, Kate finds that Harry and Naomi have disappeared and that the Doctor has left behind a note explaining that they have joined him in the TARDIS.

Cast

 * Kate Stewart - Jemma Redgrave
 * Osgood - Ingrid Oliver
 * Missy - Michelle Gomez
 * Josh Carter - James Joyce
 * Jimmy Tan - Chris Lew Kum Hoi
 * Varliss - Alisdair Simpson
 * Hugo de Costa / Crastor - Harry Myers
 * Harry Sullivan - Christopher Naylor
 * Naomi Cross - Eleanor Crooks

Continuity

 * Osgood froze Harry and Naomi to protect them from an explosion. (AUDIO: One Way or Another)
 * Kate mentions visiting 16th century France and the Pacific Ocean in World War II. (AUDIO: The Destiny Labyrinth)
 * Kate mentions her experience with Dominator technology. (AUDIO: Power of the Dominators)
 * Hasper's presence was due to a time glitch. He came from an alternate timeline where the Time Lords survived the Last Great Time War. (AUDIO: The Man From Gallifrey)
 * Missy has put the Eleven "out of the way", outside of normal space and time. (AUDIO: Time of the Vulpreen)
 * Missy says that she might kill the Eleven one day. (AUDIO: Day of the Master)
 * Kate endured a labour camp on the Void World. (AUDIO: Ten Minutes in Hell)
 * Missy killed the Zygon Osgood. (TV: Death in Heaven)
 * Missy previously used the Cybermen. (TV: Dark Water / Death in Heaven)
 * Harry and Naomi leave with the Seventh Doctor. (AUDIO: London Orbital)