Scientist Albert Dooley (Dean Jones) struggles to pay the bills. His wife, Katie (Sandy Duncan) gets a recipe for applesauce wrong and gives it to her husband to take to work for lunch, hoping it will help cut down on the budget. In a humorous chain reaction, the duck Albert is testing steals the applesauce after Albert has thrown it away in the trash and then wanders into a radiation lab and becomes irradiated. Albert is ordered to get rid of the duck, so he figures he can give it to his son, Jimmy (Lee Montgomery) who has been wanting a pet, only to discover it now lays eggs with solid gold yolks. In a Pavlovian manner, the duck, named "Charley" (despite being female), lays an egg when prompted by the barking of a dog. At first, the only ones who know of Charley's golden yolks are Albert, Katie, Jimmy and Albert's friend, Fred, but as they sell the yolks of gold, they gain the attention of a suspicious neighbor, a government bureaucrat from the U.S. Treasury Department named Mr. Hooper (Joe Flynn). Hooper spies on the Dooleys in a haphazard manner, often suffering a mishap such as falling off a tree branch after being yelled at by Mrs. Hooper to leave the neighbors alone. However, Hooper sees a golden yolk laid firsthand, with Fred and Albert celebrating.... Directed by Vincent McEveety Produced by Bill Anderson Written by Ted Key Roswell Rogers Starring Dean Jones Sandy Duncan Joe Flynn Tony Roberts James Gregory Lee Montgomery Music by Buddy Baker Paul J. Smith Cinematography William E. Snyder Edited by Lloyd L. Richardson