Big Bad Mama is a 1974 depression-era adventure film about a single mother and her bank-robbing daughters. In 1934 Texas, Wilma McClatchie (Angie Dickinson) is a bootlegger who isn't making enough money to support her teen daughters Billy Jean (Susan Sennett) and Polly (Robbie Lee). Fred (Tom Skerritt) is a bank robber who crosses paths with Wilma and tells her that his line of work is more profitable.
Fred, Wilma and her daughters do a few bank heists that are moderately profitable, but Wilma has her eye on the big stakes. The crew continue with their robberies and come across sophisticated yet crooked gambler William J. Baxter (William Shatner). Fred isn't too happy about William tagging along because they both are interested in sexy Wilma. Now that Wilma is getting a taste of the good life, she convinces William and Fred to kidnap Jane Kingston (Joan Prather), the daughter of a millionaire. Jane is a snob and turns out to be a handful, as she hurls insults at Wilma. The gang holds Jane hostage and demand $1 million for her return. After Jane's father agrees to pay, Wilma leaves to pick up the money. Fred loves the ladies and is more than eager when Jane pretends to want to have sex with him. After a well-placed knee, Jane escapes.
Enraged over what happened with Jane, Wilma admonishes both Fred and William. Wilma also finds out that her daughter Polly is carrying Fred's child. Wilma and her gang do more bank robberies, but the law is now hot on their trail. The gang is trailed to a hiding spot, and a gun battle breaks out. While Wilma, Polly and Billy Jean escape, both Fred and William die in the shootout. As Wilma is riding with her daughters, a trickle of blood runs down her arm, and she falls over. It is unknown if Wilma is dead or alive.