|Bing Crosby||Scat Sweeney|
|Bob Hope||Hot Lips Barton|
|Dorothy Lamour||Lucia Maria de Andrade|
|Gale Sondergaard||Catherine Vail|
|The Wiere Brothers||Three Musicians|
|George Meeker||Sherman Mallory|
Suave singer Scat Sweeney and his partner, Hot Lips Barton, stow away on a ship leaving New Orleans for Rio de Janeiro. On board, Scat falls for the beautiful and wealthy Lucia Maria, whose guardian is hypnotizing her into consenting to an arranged marriage to the scoundrel Sherman Mallory . In Rio, the trio pose as a Brazilian song-and-dance act in an attempt to outwit Lucia Maria's predators.