
Professor Ned Brainard’s breakthrough with the super‑elastic “Flubber” has already brought trouble, and his new gravity‑defying off‑shoot, “Flubbergas,” faces relentless government interference and his wife Betsy’s frustration. A clever alteration to a football uniform might finally prove his invention’s worth.
Does Son of Flubber have end credit scenes?
No!
Son of Flubber does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of Son of Flubber, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Bob Sweeney
Mr. Harker

Ed Wynn
A.J. Allen

J. Pat O'Malley
Sign-Painter (uncredited)

Charles Ruggles
Judge Murdock

Ken Murray
Mr. Hurley

Joanna Moore
Desiree de la Roche

Leon Ames
Rufus Daggett

Paul Lynde
Sportscaster

Jack Albertson
Mr. Barley

Keenan Wynn
Alonzo P. Hawk

Alan Hewitt
Prosecuting Attorney

William Demarest
Mr. Hummel

Elliott Reid
Shelby Ashton

Fred MacMurray
Ned Brainard

Edward Andrews
Defense Secretary

Nancy Olson
Betsy Brainard

Tommy Kirk
Biff Hawk

Harvey Korman
Husband in Commercial (uncredited)

Joe Flynn
Rex Williams (uncredited)

Dal McKennon
First Juror (uncredited)

James Westerfield
Officer Hanson

Robert Shayne
Defense Secretary's Assistant (uncredited)

Eddie Ryder
Mr. Osbourne

Darby Hinton
2nd Hobgoblin (uncredited)

Stuart Erwin
Coach Wilson

Byron Foulger
Proprietor (uncredited)

Arthur Tovey
Juror (uncredited)

King Mojave
Board Member (uncredited)

Russell Custer
Board Member (uncredited)

George Ford
Courtroom Spectator (uncredited)

Alan Carney
Referee

Forrest Lewis
Officer Kelly

Harriet E. MacGibbon
Mrs. Edna Daggett

Beverly Willis
Mother in Commercial

Wally Boag
Father in Commercial

Burt Mustin
1st Bailiff (uncredited)

Ron Nyman
Courtroom Spectator (uncredited)

Ginny Tyler
Baby Walter (voice) (uncredited)

Leon Tyler
Humphrey Hacker (uncredited)
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Challenge your knowledge of Son of Flubber with this fun and interactive movie quiz. Test yourself on key plot points, iconic characters, hidden details, and memorable moments to see how well you really know the film.
What is the name of the professor who invents Flubbergas?
Ned Brainard
Alonzo P. Hawk
Betsy Brainard
Shelby Ashton
Show hint
Read the complete plot summary of Son of Flubber, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
Professor Ned Brainard’s discovery of Flubber has not brought him or his college the wealth he hoped for. The Pentagon designates the invention as “top secret” and the IRS lands him with a crushing tax bill, all while no money has actually been earned from the invention. Ned clings to a possible breakthrough in Flubbergas, described as the “son of Flubber,” a substance that could even influence the weather.
His experiments with the ray projector make it rain in his kitchen and garage, but the catch is clear: Flubbergas only affects makeshift clouds. When it encounters real clouds, the rain turns into a destructive shower that shatters glass all over town. This mishap draws the ire of Alonzo P. Hawk [Alonzo P. Hawk], who schemes to close Medfield College and push a fraudulent glass-claim partnership.
At home, Ned’s wife, Betsy Brainard, is overwhelmed by financial stress and increasingly unsettled by the attention Ned receives from an old high school flame who reappears in their lives as Shelby Ashton [Shelby Ashton]. The tension intensifies as Shelby tries to rekindle the past, testing the boundaries of Ned and Betsy’s marriage. When Ned senses the threat Shelby poses, he uses the weather ray to rain inside Shelby’s car, with thunder and lightning, turning the interior into a flooded mess and triggering a crash that mirrors a past mishap from another chapter of his life.
Flubbergas also proves its odd usefulness when Medfield rides to a football victory over Rutland, buoyed by the crowd-pleasing oddity of the weather-influenced win. Betsy, meanwhile, makes a decision about her loyalties, and Ned is arrested for damages linked to the glass incident, straining their relationship even further.
Inside the courtroom, the prosecutor presses Ned to abandon his experiments, painting a bleak future if he continues. Yet the county agricultural extension agent steps forward with a surprising testimony: crops around town have thrived because of Ned’s work, under the label Dry Rain. This new evidence shifts the momentum, and Ned earns an acquittal, allowing the couple to reunite.
The final stretch of the story follows them home in their flying car, where Betsy expresses a renewed fondness for Ned’s science, and the pair share a kiss. The film closes with a whimsical image: a football filled with Flubbergas soaring into outer space, a playful nod to the film’s scientific whimsy and its ties to Ned’s inventive spirit.
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