Karen Armstrong is a character from The Mammal Wars. She is a British criminal who is the leader of the Women of the Night. While she is never named in the Surgeon stories, her organization is one of a few characters to be re-used by the wiki founder alongside Forbflaith Hennessy, Katja Naganowska and the students depicted in The Yeti Factor.
In later life, she later becomes a terrorist who is forced to serve under PHANTOM until its demise, at which point she and the other Women of the Night become Vixens.
She is a thirty four year old British woman with fair skin, black hair and brown eyes. Like many other criminals in literature by the wiki founder, Karen is dressed in leathers which consist of black leggings, a black leather jacket, black knee length boots and black leather gloves.
Many criminals in literature are regarded as being firm and harsh but fair when it comes to deciding who to send for assignments; however Karen is shown to be a lot more dictatorial and harsh on her forces. This is particularly shown when she chooses on who to send into Sheephouse Wood to help Forbflaith Hennessy.
While the Eastern Vixens for example would put themselves forward to carry out an assignment such as a robbery, Karen decides on who to send into Sheephouse Wood, asks them to convince her and eventually settles on a particular criminal; the criminal in question being Eleanor Bywater. A friendship between Karen and Forbflaith is also hinted when the latter phones after escaping from prison.
Like Yevgenia Agrafena from Defenders of Earth as shown in King of the East, Karen is first shown as a shadowy figure in the base of the Women of the Night in Chenie's Manor in Buckinghamshire where she receives a phone call from escaped criminal and scientist Forbflaith Hennessy who wants to return to her glory days.
On the phone, Karen assures Forbflaith she has complete co-operation from her forces before hanging up and asking her forces to meet in a room beneath the manor house. Here, she tells her forces about Forbflaith's escape from prison and presence in Buckinghamshire as well as telling them that she promised Forbflaith total co-operation from the Women of the Night.
While most criminals are known for their diplomacy in the wiki founder's literature such as the Eastern Vixens from Defenders of Earth, Karen immediately chooses three women to step forward in the form of Eleanor Bywater, Alice Beresford and Denise Axford; she then asks them to convince her as to why they should go to help Forbflaith. Finally, Karen chooses Eleanor to do the job and dismisses the other women.
Following the events of Seslinian vs Zebiccoon, it is revealed that since the capture of Forbflaith Hennessy by PHANTOM, Karen and the Women of the Night have been forced into hiding and ultimately have been forced to move to another place in the United Kingdom. But Karen's plans are almost foiled before they even begin by the fact that the country has manhunts for them in every city imaginable.
Eventually, Karen is forced to move the Women to the city of Southampton under very strict conditions; they are placed under virtual house arrest at Bargate while they are either disguised or in their normal clothing. So far, however, the police have been unable to track them down but that changes when PHANTOM are described in the story to have operatives in Eastern and Western Europe alike.
In the end, PHANTOM catch up to the Women of the Night and along with the rest of the women, Karen is captured on a PHANTOM raid on Bargate and taken away in a truck under PHANTOM escort with the rest of the prisoners to HMNB Portsmouth. Due to her subordinates being contained in a sealed truck, she does not see the road being blocked by Bastamander who is leaving the Southampton New Forest Wildlife Park to fight Ostesooks who has escaped from the Marwell Zoo in Winchester.
The truck takes the Women of the Night first to the Estonian capital city of Tallinn, then to the PHANTOM compound in Siberia where the women are brainwashed in a different way to Forbflaith; instead, they are incarcerated in floating cyndrical cells and have helmets lowered onto their heads and brainwashed. On the other side, the women join the other female composed criminals from Eastern and Western Europe that have also been brainwashed to serve PHANTOM (Forbflaith is not among these, because she has been imprisoned with common women).
Upon being brainwashed by PHANTOM, Karen and her subordinates serve under them during the PHANTOM-Vixen conflict. On the end of the conflict, Karen and the women are taken captive by the Vixens and brainwashed to serve the Vixens which they do until the Vixens' dissolution.