Richard Dix as Richard 'Mack' McAllan

Leslie Banks as Frederick 'Robbie' Robbins

Madge Evans as Ruth McAllan

Helen Vinson as Varlia Lloyd

C. Aubrey Smith as Lloyd

Basil Sydney as Mostyn

Henry Oscar as Grellier

Hilda Trevelyan as Mary

Cyril Raymond as Harriman

Jimmy Hanley as Geoffrey McAllan

George Arliss as Prime Minister of Great Britain

Walter Huston as President of the United States