Montgomery Clift

as Ralph Stevenson

Ivan Jandl

as Karel Malik aka 'Jim'/'Jimmy'

Aline MacMahon

as Mrs. Murray

Wendell Corey

as Jerry Fisher

Jarmila Novotná

as Hannah Malik

Mary Patton

as Mrs. Fisher

Ewart G. Morrison

as Mr. Crookes

Leopold Borkowski

as Joel Markowsky