Young Tom Edison

Mickey Rooney

Thomas Alva 'Tom' Edison

George Bancroft

Samuel 'Sam' Edison

Fay Bainter

Mrs. Samuel 'Nancy' Edison

Virginia Weidler

Tannie Edison

Eugene Pallette

Mr. Nelson

Victor Kilian

Mr. Dingle

Bobby Jordan

Joe 'Joey' Dingle

Lloyd Corrigan

Dr. Pender