Jeanne Crain

Peggy Taylor

William Holden

Jason Taylor

Edmund Gwenn

Prof. Henry C. Barnes

Gene Lockhart

Prof. Edward Bell

Griff Barnett

Dr. Philip Conway

Randy Stuart

Dorothy

Betty Lynn

Wife

Marion Marshall

Ruth

Pati Behrs

Jeanne

Charles Lane

Prof. Collins (uncredited)

Gene Nelson

Jerry (uncredited)

Ray Walker

Carson (uncredited)

Almira Sessions

Mrs. Landon

Houseley Stevenson

Prof. T.J. Beck

Henri Letondal

Prof. Roland Pavin

George Seaton