|Fred Astaire||Finian McLonergan|
|Petula Clark||Sharon McLonergan|
|Tommy Steele||Og the Leprechaun|
|Keenan Wynn||Senator Billboard Rawkins|
|Al Freeman Jr.||Howard|
|Don Francks||Woody Mahoney|
|Barbara Hancock||Susan the Silent|
Feisty Irishman Finian McLonergan and his faithful daughter, Sharon, bearing a pot of gold stolen from the leprechaun Og, settle in the village of Rainbow Valley, Missitucky. Siding with local sharecroppers like Woody Mahoney against a blustering, bigoted local politician, the McLonergans get into a number of fanciful scrapes while being pursued by the magical Og, who will become mortal if he doesn't recover his gold.