This is Warner Bros.’ latest DC Comics-based film, following “Aquaman,” Shazam!” and “Joker.” It focuses on Harley Quinn (Margot Robbie), first introduced in “Suicide Squad” (2016), who tries to save the life of a young girl, going up against villainous Black Mask.

Born Harleen Quinzel, she had a Catholic-school upbringing and serious daddy issues. After earning a Ph.D. in psychology, she fell madly in love with the Joker when he was incarcerated at Arkham Asylum and helped him escape. But as this story begins, they’ve split up.

Having lost the formidable protection of the psychopathic Joker, Harley’s No. 1 on the wanted list of crime boss Roman Sionis (Ewan McGregor), known as Black Mask. He covets a diamond that holds the key to a vast fortune; it’s a gem that was stolen by pickpocket Cassandra Cain (Ella Jay Basco).

To accomplish her mission, Harley assembles a girl-powered posse. The Huntress (Mary Elizabeth Winstead) is Helena Bertinelli, daughter of a mob family that was murdered. As the sole survivor, she’s determined for revenge with her trusty crossbow.

Black Canary (Jurnee Smollett-Bell) is Dinah, a singer who has the ability to emit a sonic scream that can shatter eardrums. Although she lacks superpowers, Detective Renee Montoya (Rosie Perez) has a romantic relationship with Kate Kane — aka Batwoman.

Directing her first major feature, Chinese-American Cathy Yan churns Christina Hodson’s crudely pulpy plot with exciting action sequences, but she’s subverted by far too many unresolved subplots.

Determined to play a foul-mouthed, substance-abusing, uber-violent Gotham crime fighter, Australian actress Margot Robbie (“Once Upon a Time ... in Hollywood,” “Bombshell”) helped develop the nihilistic script, inspired by “Trainspotting” and “True Romance.”

On the Granger Movie Gauge of 1 to 10, “Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn)” flies in with a kinetic, superhero 6, serving as a showcase for Margot Robbie.

Susan Granger has been an on-air television and radio commentator and entertainment critic for more than 25 years. Raised in Hollywood, Granger appeared as a child actress in movies with Abbott & Costello, Red Skelton, Lucille Ball, and Lassie. She currently resides in Westport.