Kate Kane, also known by her superhero alias Batwoman and supervillain alias Circe Sionis, is a fictional character in The CW's Arrowverse franchise of TV series, first mentioned in the 2018 episode "Nora" of the television series The Flash,[1] based on the character of the same name, created by Geoff Johns, Grant Morrison, Greg Rucka, Mark Waid and Keith Giffen in 2006,[2] and adapted for television by Caroline Dries.

This version of Batwoman has also appeared in other series such as The Flash, Arrow, Supergirl and Legends of Tomorrow, for the Elseworlds and Crisis on Infinite Earths crossover events.

Rose said that she took the role too serious, and had a diet, while training everyday, something easy to her after she starred in xXx: Return of Xander Cage and John Wick: Chapter 2.

Rose left the show in 2020, initially claiming abuse by the studio;[17] however, in October 2021, Warner Bros. and Luke Fox actor Camrus Johnson confirmed that Rose had actually been fired from the series following "multiple complaints about [her] workplace behavior that were extensively reviewed and handled privately out of respect for all concerned" over the course of an investigation that took place over several months.

On January 26, 2003, Kate and Beth had a bat mitzvah party, and while their mother was driving them home, the Joker hit the car with a school bus, almost throwing it off a bridge.

Following Kate's expulsion, Jacob suggested that she leave Gotham to travel around the world, training under combat and survival specialists.

She went back to the Wayne Enterprises to talk to Luke, and discovered the Batcave, realizing her cousin's secret identity is Batman.

Luke revealed to her that he was devastated by his mistake in the car crush that killed her mother, and felt he had to take care of his cousin.

After the operation, Kate goes to her father, but have a heated argument, leaving to talk to Sophie, in which she expresses her feelings, when she abandoned her in the military academy.

As she was about to leave Wayne Enterprises, she found a box containing a bat and a letter, revealing that Alice is Beth, and knows that Kate is the superhero dressing up a Batman.

Ten days later, in her journal, she wrote that the reason for wearing the Batsuit, was to scare Alice and her gang, but now she can't anymore, while doubting her ability to being a hero.

She returns to the Wayne Tower, where is found Tommy Elliot inside Bruce's office, who is there to invite him to a celebration party, only to find out he is missing.

Luke then calls Kate to tell her that the only gun that can penetrate the Batsuit has been stolen from one of Wayne Tower's secret weapons facilities.

As Kate suspected Elliot to be behind this, she attends his party, and talks to him, learning that he knew Bruce is Batman, and that's why he stole the gun, so that he could kill him.

After an altered reality Oliver Queen / The Flash and Barry Allen / Green Arrow, with Kara Danvers / Supergirl from Earth-38, were arrested in Gotham City, Kate bails them out from jail.

Kara met with Kate, and discussed the situation, asking if she knew who John Deegan, who altered reality using the Book of Destiny, saying her that he used to work at Arkham Asylum.

She interrogates Alice, and learns that Catherine Hamilton faked her death, and that a man saved her after the car crush, whom she never learnt his name, and kept by force.

She eventually escaped, and found Mouse, who threaten to kill, if she didn't let go of her father, who was captured when trying to save Kate.

Sometime later in the Crows headquarters, Jacob tells Kate about the man who kept Alice, August Cartwright, a madman with a medical license.

When Kate was chasing an assassin called Rifle, she meets Julia Pennyworth and asked her to wear the Batsuit, and pretend to be Batwoman, to distract Sophie.

As Julia was leaving Gotham, she said to Kate to not allow people to get close to her, a big mistake Bruce Wayne / Batman made.

The next day, Kate invited her step-sister to help her open a gay-bar, right across the street of a man who had shown homophobic actions.

On December 10, 2019, Kate was fighting members of the Wonderland Gang, when Lyla Michaels / Harbinger appeared and teleported her to Earth-38, in the headquarters of the Department of Extranormal Operations.

There she joined other heroes, like Oliver Queen / Green Arrow, Mia Queen, Barry Allen / The Flash and Ray Palmer / Atom from Earth-1, and with Clark Kent / Superman, Kara Danvers / Supergirl and J'onn J'onzz / Martian Manhunter fought the Anti-Monitor's forces, not being able to stop them, with The Monitor teleporting the heroes away, while billions of refugees of Earth-38, left for Earth-1.

When a brainwashed Lyla, by the Anti-Monitor, attacked the heroes, Nash Wells / Pariah sent the Paragons to the Vanishing Point, a place out of the timestream.

Then, Barry took her to the Dawn of Time, where with the other six Paragons, battled the Anti-Monitor's army, and Oliver sacrificed himself to restart the Multiverse.

After the creation of Earth-Prime, she joined Barry, Kara, Ray and Mick Rory to fight a giant Beebo controlled by Sargon the Sorcerer, who was defeated.

One day she flew to National City, to meet with Kara Danvers / Supergirl, on whether to destroy the piece of kryptonite she had in her possession.

[22] After her casting, Rose had to delete her Twitter account, citing the backlash from the fans she received,[23] and some online reactions attacked Rose for not being Jewish, while the main focus of the criticism was the assertion that the fact she identifies as gender fluid made her "not gay enough"[24] although some media came to her defence, describing her casting as "perfect",[25] with Stephen Amell, the protagonist of the show Arrow that kickstarted the shared universe, said on Twitter that her "character will carry the universe [Arrowverse] into the future.

[28] After the ending of season 1, Rose was fired by Warner Bros., a move the company justified on the low ratings of the show, but also the fan backlash to her too.