A CIA agent is used as a pawn in an insane woman’s plan to steal a Polaris submarine.

Rhythm and Blues Revue", is a 1955 feature film compiled by Studio Films, Inc. from previously recorded Snader Telescriptions featuring renowned African American jazz singers and musicians from the 1950s. Performers include Faye Adams, Bill Bailey, Ruth Brown, Cab Calloway, Nat King Cole, Count Basie, Martha Davis, The Delta Rhythm Boys, Freddy and Flo, Lionel Hampton, Herb Jefferies, The Larks, Little Buck, Amos Milburn, Mantan Moreland, Nipsey Russell, Big Joe Turner, Sarah Vaughan and Willie Bryant.

Lucy's sister, Marge, shows up after leaving her new groom Hughie over an argument.