The mobster Ma Parker and her felonious family, Pretty Boy, Mad Dog, Machine Gun and Legs arrive in Gotham City, and begin a wave of crime. Their first act is to disrupt the Gotham Ladies Auxiliary's Mother of the Year Awards Ceremony, where they rob the entire audience of their valuables. Commissioner Gordon and Police Chief O’Hara call in Batman and Robin, and it is not long before the Dynamic Duo manage to track the villains to their home on Cherry Blossom Road. But the gangsters use a smoke bomb to confuse the two crime fighters, and all but Pretty Boy escape. Ma and her gangsters then steal the takings from a theatre’s box office, but Machine Gun is also captured, followed by Mad Dog when an attempt to hold up a drugstore goes awry. Batman and Robin finally locate Ma and Legs at an ol