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Vice Admiral Katrina "Kat" Cornwell was a Human female Starfleet flag officer who lived during the mid-23rd century. She was a psychiatrist or psychologist by training, and had experience treating PTSD. (DIS: "Choose Your Pain", "Lethe", "Into the Forest I Go")

As of "Lethe", Cornwell has not explicitly been identified as a psychiatrist or psychologist, but this is heavily alluded to by her history practicing counseling in some aspect, and being called "doc".
Cornwell was a vice admiral, as her badge was consistent with this rank. She was referred to onscreen as "admiral", as an admiral of any rank was, as an honorific.

History Edit

Cornwell was an old acquaintance of Gabriel Lorca, with the two of them being on a first-name basis. (DIS: "Choose Your Pain")

In November of 2256, she informed Lorca - who had by then been replaced by an impostor from a parallel universe and made captain of the USS Discovery - about a concurrent Klingon attack on Corvan II and ordered him to protect that planetoid. (DIS: "The Butcher's Knife Cares Not for the Lamb's Cry")

Cornwell at Starbase

Cornwell at a Starfleet starbase

In December of 2256, she attended a strategy briefing with Lorca, Terral, and three other admirals. She ordered Lorca to restrict use of the spore drive, since the Klingons might have learned of it and might target the Discovery. (DIS: "Choose Your Pain")

A week later, she visited the Discovery after Lorca launched an unauthorized rescue mission for Ambassador Sarek, whose ship had been disabled on the way to a diplomatic mission by an explosion that had deliberately been caused by an aide who had turned out to be a logic extremist. Cornwell and Lorca attempted to rekindle their romantic relationship. However, Cornwell made the decision to declare Lorca unfit for command after she tenderly awoke him the morning after, and he responded with a phaser in one hand and his other at her throat (due to lingering trauma relating to Lorca having recently served time in a Klingon prison; she was quite upset he kept a phaser under his pillow).

Cornwell on Cancri IV

Cornwell meets with Klingons on Cancri IV

However, Sarek was too injured to attend his diplomatic mission to Cancri IV, a meeting with a supposed dissenting Klingon faction which could end the war, so Cornwell took Sarek's place, planning to recommend Lorca be stripped of command afterwards. The mission turned out to be a trap orchestrated by Klingon General Kol, and Cornwell was captured by Dennas and Ujilli. (DIS: "Lethe")

Sometime later, Cornwell was kept prisoner by Kol aboard the Sarcophagus. Despite weeks of torture, she refused to give up any information. L'Rell offered her services to Kol as an interrogator in exchange for a cloaking device, but this was a ruse in order to get close to Cornwell. The imprisoned admiral met L'Rell when the latter arrived in her cell. At her insistence, Cornwell screamed, which she used to distract a guard away from the area. The admiral also learned that L'Rell wanted to defect to the Federation in exchange for helping her escape, the Klingon having grown disillusioned with how easy her people fell in line with Kol.

Cornwell and L'rell attempt escape

Cornwell and L'Rell attempt escape

However, during the escape, L'Rell and Cornwell were confronted by Kol. Realizing they were unlikely to escape, Cornwell grabbed L'Rell's blade and attacked her, in order to maintain the illusion in front of Kol's men. Afterward, L'Rell hid the unconscious Cornwell in a side room – a room which, to L'Rell's horror, was filled with corpses. (DIS: "Si Vis Pacem, Para Bellum")

When Ash Tyler and Michael Burnham infiltrated the Sarcophagus to place sensors on the ship to allow Discovery to detect the Klingon ship while it was cloaked, the pair picked up Cornwell's life signs and found her in the side room where she had been placed earlier. Discovering L'Rell present in the same room, Tyler began experiencing intense flashbacks, and was unable to continue the mission. Burnham went on to complete the placement of the sensor on the bridge, while Cornwell tried to bring Tyler back to reality.

After Burnham successfully completed the placement of the sensors, Cornwell was beamed back to the Discovery along with Tyler, Burnham, and L'Rell. Cornwell was sent by emergency medical shuttle to Starbase 88 where she underwent surgery. She was expected to make a total recovery. (DIS: "Into the Forest I Go")

Katrina Cornwell aboard Discovery

Admiral Cornwell in temporary command of Discovery

Following the Discovery's return from the mirror universe without Captain Lorca, Cornwell was visibly angered upon hearing of his betrayal, and upset at the presumed death of his prime universe counterpart. She assumed temporary command of the Discovery and took it to Starbase 1, only to discover that the starbase had been overrun and occupied by Klingon forces. When the mirror universe version of Philippa Georgiou proposed that the Federation strike the Klingon homeworld of Qo'noS directly, by detonating a bomb inside its mantle and rendering it uninhabitable, Cornwell supported the plan, even going so far as to help Georgiou masquerade as her deceased counterpart.

Discovery crew honored in Paris

Cornwell honors the crew of Discovery after the war

However, the Discovery's crew objected to the genocide they were about to be complicit in and threatened mutiny. When Specialist Burnham pointed out that Cornwell was making the same mistake she herself had made just before the Battle of the Binary Stars - forgoing Starfleet principles for the sake of survival - Cornwell abandoned the plan. Instead she authorised Burnham to give L'Rell the bomb's detonator so that L'Rell could use it as leverage to take charge of the Klingon Empire and end hostilities. Cornwell later honored the crew of the Discovery for their actions during the war. (DIS: "The War Without, The War Within", "Will You Take My Hand?")

Key dates Edit

Appendices Edit

Appearances Edit

Background information Edit

Cornwell was portrayed by actress Jayne Brook.

The first name "Katrina" was initially only mentioned in the Netflix German voice dubbing list for "The Butcher's Knife Cares Not for the Lamb's Cry", but was first spoken in the following episode, "Choose Your Pain".

In Episode 4 of After Trek, shown after "Choose Your Pain", showrunners Gretchen Berg and Aaron Harberts mentioned that Cornwell is a psychiatrist by training, who is not only old friends with Lorca, but is assessing him as she supervises him, and is worried about him.

When asked how Cornwell would handle Saru's "break from reality" in "Si Vis Pacem, Para Bellum", Jayne Brook commented that the admiral would try to talk Saru down slowly rather than threaten to remove him from serving on his ship. Brook went on to say, "I think that she would give him time. I think she's a measured person who gives people the space, or wants to give them the space, to heal, and to observe herself. I think she would observe him and give him time." (After Trek: "Episode 7")

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