The Willards from Terre Haute, Indiana travels abroad for the once-in-a-lifetime vacation in Paris, France. Harry Willard believes that the greatest problem will be avoiding tap water, but bringing his three children will prove to be more troublesome
| Actor | Role |
|---|---|
 Fred MacMurrayHarry Willard | Harry Willard |
 Jane WymanKatherine "Katie" Willard | Katherine "Katie" Willard |
 Michael CallanNick O'Mara | Nick O'Mara |
 Deborah WalleyAmy Willard | Amy Willard |
 Jessie Royce LandisCountessa 'La Comtesse' DuFresne | Countessa 'La Comtesse' DuFresne |
 Tommy KirkElliott Willard | Elliott Willard |
 Georgette AnysMadame Clebert | Madame Clebert |
 Kevin CorcoranSkipper Willard | Skipper Willard |
 Ivan DesnyRudolph Hunschak | Rudolph Hunschak |
 Françoise PrévostThe Girl | The Girl |
 Alex GerryHorace Bidwell | Horace Bidwell |
 Howard SmithJudge Henderson | Judge Henderson |
 Max ShowalterThe Tight Suit | The Tight Suit |
 Doris PackerMrs. Henderson | Mrs. Henderson |
 James MillhollinShip's Librarian | Ship's Librarian |
 Richard WattisParty Guest | Party Guest |
| GGeorge BoyceShip Passenger | Ship Passenger |