The Sirens was remotely formed by Barbara Kean with the help of Ra's al Ghul's influence. However, after Tabitha's death and Selina was shot by Jeremiah Valeska, Barbara was left on her own, occasionally aiding the GCPD during No Man's Land. Once the cataclysm ends and the city returns to normal, it can be assumed that the group was disbanded due to the death of Tabitha Galavan coupled with Barbara giving birth to Jim Gordon's daughter and becoming a legitimate businesswoman.
One night, Selina Kyle was about to pay a mysterious building a visit since she found a business card on the door this morning. However, Tabitha surprisingly showed up behind her, asking her what she were about to do there and angry asking Selina if she taught her nothing, since she could have slit her throat before she even her. Selina told her about the visiting card that spells "An opportunity awaits", leading to Tabitha herself revealing that she got a card herself. Both then moved on to open the heavy door to the building. As soon as they were inside, a revived Barbara Kean thanked them for coming and turned on the light. Tabitha and Selina were shocked to learn about Barbara's revival, with Kean ironically telling former that it is Gotham they are living in and she shall check the pulse next time. Galavan then immediately drew a knife with the intention of killing her once again. Selina however was interested in how Barbara came back to life again, but she refused to give an answer, just replying that it is a long story and all they need to know is that she is back and as the card says an opportunity and anew beginning awaits. Barbara moved on telling Tabitha that she thought about what happened over and over and that she regrets what she did. But Galavan then grabbed Kean to finish the job this time, though Barbara apologized for what she did and accepted her death if Tabitha does not believe her. After Tabitha pushed her to the ground, Kean stood up and moved on explaining her visitors that this new place is now theirs. After Tabitha ironically said how original the idea of another club in Gotham is, Barbara denied it is a club and moved a lever causing multiple walls to flip around and reveal weapon arsenals. She then told them that Penguin took control over the city and she plans on selling the weapons to criminals operating under his licenses all around Gotham to find out what they are planning and how it is going down. But she refuses to go forward with Tabitha and Selina. However, Tabitha left the building telling her former partner that she can not forget what she took from her. After she was gone, Barbara asked Selina to talk to Tabitha about it.
Some time later, the Sirens and a Speed Demonz gangster from whom they stole from gathered at the Iceberg Lounge to clear things up with Oswald Cobblepot, since the Demons paid for one of Penguin's licenses. However, Oswald's bookkeeper Penn entered the room, whispering something in Cobblepot's ear causing him to scream in rage. He then ordered Penn to repeat the information for the guests. It turned out that Edward Nygma, who owes his life to Cobblepot's mercy is repaying that generosity by aping his benefactor in a crude comedy show. Due to Selina Kyle's blankness, Penguin explained her that Nygma is making fun of him in a clown show in the Narrows. Because of him screaming all the time, Cobblepot turned around and had to calm down, causing Selina to giggle, despite Tabitha Galavan's displeasure. When he noticed Selina's amusement, Oswald started to laugh himself, but as the Soeed Demonz member began to laugh in an artificial way to satisfy Cobblepot and called Nygma "Riddler", Penguin drew a knife hidden in his cane to stab the gangster in the throat. He then told the dying man that this is not his name, instead it is simply plain dumb Ed and explains him that he don't knows him, so he don't gets to laugh. Barbara Kean then thanked Oswald for solving the problem for the Sirens, but Penguin responded that what they owed the gangster, they now owe him. Cobblepot ordered them to go to the Narrows to see Nygma's act themselves, then bundle him up and bring him back to him by nightfall. When Selina told him they want something in return, Penguin threatened the Sirens by telling them that in exchange he will not send every criminal in the city after them, not let them cut out their eyes and feed them to them, along with their ears, noses and tongues. Barbara accepted the deal in place of the whole team and left along with Tabitha and Selina. As soon as they were gone, Oswald explained Firefly, who was present all the time, that Penn will put her in contact with Cherry, his informant from the Narrows. If the Sirens do not have Ed in hand promptly, she shall go down there and burn them all to cinders. Bridgit then asked Cobblepot what about feeding them their eyes and all that to which he answered her to trust him that even though it is a good idea, it is far too messy to be practical. When the three of them managed to get Edward Nygma in their clutches, Leslie Thompkins as the Sirens pit their champion against Nygma's champion Solomon Grundy. During the fight, Tabitha tried to get Butch to remember who he was with the battle ending in a draw. Firefly showed up to finish the job following the Sirens' failure. Before she can burn the Sirens and Edward Nygma with her fires, Leslie Thompkins shot her tank where Firefly was disabled upon being sent flying into the wall. When it was revealed that Cherry was the informant to Cobblepot, Barbara shot Cherry in the head and declared that the Sirens are no longer working for Cobblepot.
No Man's Land
Tabitha informs Barbara on what Jeremiah Valeska did to Selina and learns that he is working for Ra's al Ghul. Tabitha leads those on her side into assisting Alfred and Bruce in fighting Ra's al Ghul and Jeremiah Valeska. As Barbara forces Bruce's hand into using the embalming knife on Ra's al Ghul, the bombs on the bridges go off as Jeremiah gets away. Back at the Siren's base as Gotham City becomes a no man's land, those who were on Ra's al Ghul's side have thought it over and want to pledge their allegiance to Barbara. Tabitha comes in telling Barbara what Penguin did to Butch. As Barbara states that man is the problem in the world, she and the Sisters of the League kill the male members of the League of Shadows and leave their bodies at the edge of the Sirens' territory.
During No Man's Land, The Sirens still ran their club and used it as a safe haven for women who needed safety, also allowing men to only buy windows of time to enter the club. However, during day 87, Tabitha was stabbed in the heart by Penguin, causing Barbara to make her top priority to murder him.
- Tabitha Galavan (deceased)
- Oswald Cobblepot (on and off)
- Ra's al Ghul (benefactor turned enemy; deceased)
- League of Shadows
- Ra's al Ghul (deceased)
- Cobblepot crime family
- Jeremiah Valeska
- The Sirens are a reference to the comic book Gotham City Sirens which focuses on the titular team of Batman villainesses including Catwoman, Poison Ivy, and Harley Quinn.
- Danny Cannon originally confirmed that Ivy Pepper would eventually join the Sirens at some point. However, this never happened during the fourth season and was entirely discarded when the show had to end after the shortened season 5.
- The Sirens now have a base/club called "The Sirens" .
- Selina Kyle is the only member of the sirens who hasn't died.
- Barbara was killed by Tabitha but later resurrected by Ra's al Ghul.
- Tabitha was later murdered by Oswald to avenge his mother's death.
- ↑ Hull, Robert (writer) & Bailey, Rob (director) (June 5, 2017) "Heroes Rise: Heavydirtysoul" Gotham. Season 3. Episode 22. FOX.
- ↑ Cannon, Danny (writer) & Milito, Lous Shaw (director) (September 28, 2017). "A Dark Knight: The Fear Reaper". Gotham. Season 4. Episode 2. FOX.
- ↑ Blake, Peter (writer) & Behring, John (director) (November 2, 2017) "A Dark Knight: A Day in the Narrows". Gotham. Season 4. Episode 7. FOX.
- ↑ Huston, Charlie (writer) & Bailey, Rob (director) (November 9, 2017) "A Dark Knight: Stop Hitting Yourself". Gotham. Season 4. Episode 8. FOX.
- ↑ https://screenrant.com/gotham-season-4-sirens-origins/