- "Because we live in a society that's dictated by the male gaze. I want to control the narrative of feminism, okay? I want to show the world that a powerful, strong woman, she can wear anything! Be it a bikini, or a pantsuit."
- —Joanie to Joe West on her research.
"Girls Night Out" is the fifth episode of the fourth season of , and the seventy-fourth episode overall. It aired on November 7, 2017.
|Having received an ominous threat from her old boss, Amunet, Caitlin fears that her past time as Killer Frost may be back to haunt her. Felicity comes to Central City to help the girls celebrate Iris's bachelorette party, while Cisco, Joe and the guys take Barry out for a night on the town.|
- Grant Gustin as Barry Allen
- Candice Patton as Iris West
- Danielle Panabaker as Dr. Caitlin Snow/Killer Frost
- Carlos Valdes as Cisco Ramon
- Neil Sandilands as Professor Clifford DeVoe/The Thinker
- Tom Cavanagh as Dr. Harry Wells
- Jesse L. Martin as Detective Joe West
Special guest star
- Danielle Nicolet as District Attorney Cecile Horton
- Hartley Sawyer as Ralph Dibny
- Riley Jade Berglund as Joanie
- Matt Afonso as Weeper
- Nicholas Bradbury as Dude
- Osmond Bramble as Bouncer
- Leo Chiang as Yakuza Baddie
- Liam Hughes as Young Barry Allen
- Sean Kohnke as Police Officer #1
- Jonathan Mason as Sweaty Millenial
- Seiya Matsudo as Yakuza Leader
- Andre Pal as Officer Jerry
- Juliana Parreira as Pole Dancer
- Kat Pasion as Charity
- Sasha Rojen as Young Iris
- Mark Sweatman as Norvok
- Cameron Waters as Drunk Steve
Felicity and Iris find Caitlin so they can go to dinner. However, Caitlin tells the girls that she is not up for dinner. Felicity and Iris are eventually able to convince Caitlin to come to dinner.
At Joe's house, Cecile is looking at her ultrasound pictures with her daughter, Joanie. The doorbell rings and it's Barry, Cisco, and Harry who have come for Barry's bachelor party that Joe is hosting. Ralph shows up and convinces the guys to change their arrangements and go with him.
Iris, Felicity, Caitlin, and Cecile are out eating when Norvock approaches Caitlin and tells her that Amunet wants her. Since he wasn't taking no for an answer, a fight eventually breaks out between Killer Frost and Norvock.
Ralph takes Barry, Cisco, Harry, and Joe to one of Central City's strip clubs. They start drinking and when Barry mentions to Cisco that he wishes he could get drunk, Cisco gives Barry a special concoction that will get him drunk.
Iris, Felicity, Killer Frost, and Cecile head to S.T.A.R. Labs where Killer Frost tells everyone that Caitlin was going to leave that night and now she is going to go kill Amunet.
Back at the club, Barry is drunk and telling everybody that he's the Flash. However, everyone is having a good time and not really paying attention to what he is saying. Joe goes up to Barry and pulls him back to their table when a stripper named Jasmine makes an appearance. Joe then realizes that Jasmine is Joanie.
Elsewhere, Killer Frost located Norvock and Amunet. Killer Frost tells Amunet that she is out, but Amunet insists that Killer Forst follows her. Iris, Felicity, and Cecile have followed Killer Frost to the club. Amunet shows Killer a newly discovered meta-human, who she calls The Weeper. She reveals to Killer Frost and his tears are a drug. She also tells Killer Frost that she needs her to protect The Weeper. Killer Frost declines and is about to fight Amunet with Iris interrupts and convinces Killer Frost to leave.
Killer Frost tells Iris, Felicity, and Cecile that Caitlin had agreed to work for Amunet in order to have access to technology that would allow Caitlin to stay "in charge." Iris tells Felicity and Cecile that they have to spare The Weeper from Amunet and they agree. Iris then comes up with a plan and gives everyone their assignments.
Back at the strip club, Joe is talking to Joanie who reveals to him that her working at the strip club is research for a book she is writing.
Iris finds Killer Frost who tells Iris that she knows someone who can breach her to another earth and she plans to leave Earth-1 and start over. Iris attempts to convince her to change back into Caitlin but fails.
At the club, someone approaches Dibny and accuses him of stealing $20 from them. He denies the claim and the person tries to attack him. As more individuals join the fight, Joe attempts to break it up but is unsuccessful.
Killer Frost meets Amunet in an alley when they start battling. Amunet gets the advantage and punches Killer Frost enough that she turns back into Caitlin. Cops approach the scene and divert Amunet. With their firearms drawn, Amunet utilizes her powers and shoots pieces of metal at them, killing them both. When turns back to where Caitlin was, she notices that she got away.
Back at S.T.A.R. Labs, Caitlin is fixed up by Iris. Caitlin then opens up to Iris about what has been going on in her life the past couple of months.
After their battle at the club, all of the folks involved are in prison. Dibny's running his mouth saying he'll get them out while Barry becomes ill from the drinking. Conversing with Barry, Joe reveals that he is reluctant to be another dad once more. Barry offers a few uplifting statements. Harry then arrives and bails out Barry, Cisco, Joe, and Ralph.
At S.T.A.R. Labs, Iris, Felicity, Caitlin, and Cecile are trying to figure out how to track Amunet. Caitlin reveals to them that Amunet can control a kind of alnico alloy and Felicity utilizes that data to run a geological scan of the city. The ladies, minus Caitlin, head out to prevent Amunet from offering The Weeper to a mobster. Cecile remains in the van while Felicity and Iris go near the warehouse with a couple of weapons. As Iris and Felicity advance on Amunet, Caitlin appears. She tells Amunet that if she lets Iris and Felicity go, she'll return to work for her. Amunet denies the offer and orders her men to kill Iris, Felicity, and Caitlin. Since Caitlin was in danger, she turned into Killer Frost created an "ice shield" around herself, Iris, and Felicity. Remotely, Cecile turns on a crane that took away Amunet's metal. Killer Frost was going to kill Amunet but Iris convinces her not to. The girls scare The Weeper, who runs away from the scene.
Barry, Cisco, and Ralph arrive at S.T.A.R. Labs, where they talk about their evening with the Iris and Felicity. Killer Frost turns back into Caitlin once again, who tells everyone what has been going on in her life the past couple of months.
Cecile arrives at Joe's house with some burgers and Joanie tells Cecile that she will talk her at breakfast. Joe discloses to Cecile that he is terrified to be a dad again and Cecile concedes that she is frightened of being a parent again as well.
Iris and Caitlin are talking at S.T.A.R. Labs and Iris asks Caitlin if she will be her maid honor. Caitlin accepts.
The Weeper hops a fence in a dim alley. He is fleeing from someone who tells him that he has to complete the task for which he was born.
- This is the first episode of in which Barry appears only as a civilian and not as the Flash.
- Felicity notes that Oliver got shot with an arrow the last time they had a wedding, referencing the events of the episode "".
- In mentioning how she's always wanted a sibling, Joanie notes how it happened "seven Doctor Whos later."
- Joanie tells Joe that she became a Doctor Who fan after the protagonist became a woman, referencing the current real-life portrayal of the Doctor by Jodie Whittaker.
- Cisco describes photos of baby Barry as having "Ewok-level chub," referencing the species of furry bipeds from the Star Wars franchise.
- When Ralph goes to describe the West house, Cisco suggests "bitchin," referencing Barry's encoded message in "".
- Harry refers to Ralph as "Disney", referencing the entertainment company.
- Felicity references the Marvel character the Incredible Hulk in describing Killer Frost taking over Caitlin's mind.
- When Barry is drunk, he asks Joe why Rose didn't make room for Jack on the door, referencing the climactic scene of the 1997 film Titanic, and its protagonists Jack Dawson and Rose DeWitt Bukater.
- This is the first episode in which Barry gets drunk. Since regular alcohol has no effect on him, Cisco had to concoct a special drink that could overpower Barry's fast metabolism for his bachelor party. Cisco and Caitlin first did this in "", but the effects only lasted a few seconds in that instance since Barry had only one shot.
- When Amunet is fighting Caitlin, Caitlin gets bruised in the fight and the bruises stay visible on her face. When she later transforms into Killer Frost and then back to Caitlin, her bruises are still visible, even though the accelerated healing power that she has when she is in her meta-human state should have healed the injuries.
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