The girls had a night out for Iris' bachelorette party on The Flash Season 4 Episode 5, and it did not go to plan.
Felicity Smoak from Arrow stopped by to attend the event, but it was ruined by the arrival of someone from Caitlin's past who let his eyeball fall out of his head to reveal a tentacle.
This made Caitlin turn into her icy alter ego, Killer Frost, and she took the man down right in front of everyone.
When everyone assembled at S.T.A.R. Labs, Frost dished to the other ladies that Caitlin was going to make her way out of town because she was in a lot of trouble.
Surprisingly, Iris jumped to Frost's defense when Cecile claimed that they should not believe a word Frost says because of the whole kidnapping thing.
Iris said that Frost ultimately came through and helped them defeat the villain when it was all said and done, so they were good with her.
When Frost went to visit her old boss, Amunet, Iris saved her before the boss managed to dole out a harsh punishment that involved metal.
Frost told Iris that Caitlin wanted to find a way to keep her meta side at bay, and she accomplished the goal. However, she had to work for the leader of the black market.
Frost returned to her former boss and found herself being attacked, so it was a silly move to return in the first place, but she wanted to find a way out.
When Iris found Caitlin trying to cover up her wounds at the lab, Caitlin revealed that the only reason she returned to the team was so she could make up for some of the bad she did.
Caitlin then kept herself out of the mission and allowed Iris, Felicity, and Cecile to continue with it. They wanted to stop Amunet from selling The Weeper and his tear supply.
In the end, Killer Frost showed up to save them from Amunet and her band of misfits. Cecile switched on a magnet which helped take down Amunet.
In the end, Amunet got away, but the episode served as a way to bring Iris and Caitlin closer together, and that's what was so great about it. Iris also asked Caitlin to be her maid of honor, so it's clear they are more than work friends now.
Barry's night out was all over the place. He got a little too drunk, but they did find out that Cecile's daughter was working in a strip club, so that was fun.
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