Son of Flubber

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Fred MacMurray

Prof. Ned Brainard

Nancy Olson

Elizabeth 'Betsy' Brainard

Keenan Wynn

Alonzo P. Hawk

Tommy Kirk

Biff Hawk

Ed Wynn

A.J. Allen

Charles Ruggles

Judge Murdock

Leon Ames

President Rufus Daggett

Ken Murray

Mr. Hurley

William Demarest

Mr. Hummel

Paul Lynde

Sportscaster

Elliott Reid

Prof. Shelby Ashton

Bob Sweeney

Mr. Harker

Joanna Moore

Desiree de la Roche

Edward Andrews

Defense Secretary

James Westerfield

Police Officer Hanson

Alan Carney

Referee

Stuart Erwin

Coach Wilson

Forrest Lewis

Police Officer Kelly

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