Gotham City Sirens (film)

Gotham City Sirens is an imagined film set in the DC Cinematic Universe and serves as a sequel to both Catwoman: Relentless and Harley Quinn. It is a team-up movie featuring Harley Quinn, Catwoman, and Poison Ivy taking down Penguin.

Plot

 * Catwoman and Poison Ivy have become friends after the events of Catwoman: Relentless and live in Ivy's lair. Harley Quinn, still on the run since The Suicide Squad 2, comes to the lair (as she is one of the few trusting friends with Poison Ivy) and sees Catwoman, whom she has a little rough history with from Harley Quinn. Catwoman and Harley fight before Ivy breaks it up. Harley wants help to take down Penguin after what he did to her in Harley Quinn.
 * Additionally, the GCPD is focusing on capturing Catwoman and Poison Ivy, after the destruction they caused in Catwoman: Relentless. It is revealed in the Iceberg Lounge that The Penguin and Commissioner DeCarlo have an agreement to destroy the competition on Gotham's underground. This is shown when Great White Shark's gang comes in to attack, but are taken down by Penguin's crew, including Jay, Raven, and Lark.
 * The sirens go to Coco, a recurring villain in the Catwoman film series, who tells them that The Penguin's operations front as the Iceberg Lounge. The trio arrive and take down The Penguin. Penguin's surviving men are forced to work for Coco doing dirty work. They then decide to go back to chilling in Ivy's lair.

Cast

 * Margot Robbie as Harley Quinn

Currently on the run, she finds refuge in Poison Ivy's lair and befriends Catwoman.


 * Vanessa Hudgens as Selina Kyle/Catwoman

One of the commanding leaders of the Gotham underworld, but still hated by many.


 * Megan Fox as Pamela Isley/Poison Ivy

The backbone of the film who brings the sirens together and defeat the Penguin.


 * Danny DeVito as Oswald Cobblepot/The Penguin

Owner of the Icerberg Lounge who wants to take over the underworld after the deaths of Black Mask and the Falcones. Is killed by Harley Quinn.


 * Tim Curry as Commissioner Roger DeCarlo

The corrupt commissioner who teams up with Penguin to take down rivals such as Great White Shark and the sirens.


 * Ewan MacGregor as Ignatius Ogilvy

The Penguin's right-hand man who betrays him after his death, but is defeated by Coco.


 * Marg Helgenberger as Maggie Sawyer

A respectable officer who has a "frenemy" relationship with the sirens, similar to former commissioner James Gordon and Batman.


 * Coco Austin as Coco

A former crime boss who helps the sirens learn about the Iceberg Lounge and defeat the Penguin. After beating up Ogilvy, she takes over the Penguin's remaining empire.


 * Dana Delaney as Sarah Essen

Maggie's partner who is killed by The Penguin after discovering DeCarlo's ties with him.


 * Common as Great White Shark

A rival to the Penguin who attempts to take over the Icerberg Lounge before his forces get destroyed. Killed by Lark.

JB Smoove voices Frank the Plant, Poison Ivy's pet plant. Monique Cumen reprises her role as Detective Anna Ramirez from The Dark Knight Rises. The Penguin's female bodyguards Raven, Jay, and Lark also appear. Augustus Prew cameos as "Catman", Catwoman's #1 fan at a fan expo. Rob Delaney returns as Kite-Man.

Future
The sequel is Gotham City Sirens: Love Unleashed.