Noah Beery Jr.
Jan Trevor
Acting
Dorothy Short
Mona Andrews
Acting
Harry Woods
Borno
Acting
Bryant Washburn
Dr. Harry Trevor
Acting
Walter Miller
Dr. Frank Bracken
Acting
John Davidson
Prince Samu
Acting
Fred MacKaye
Dr. Charles Phillips
Acting
Viva Tattersall
Georgia Trevor
Acting
William Desmond
Allen
Acting
Grace Cunard
Mrs. Camerford Amster
Acting
Russ Powell
Henry Andrews
Acting
Don Brodie
Dr. Carl Neff
Acting
Harry Worth
Dr. Carl Neff
Acting
Dickie Jones
Jan Trevor as a Boy
Acting
Eddie Kane
Gen. Tichak
Acting
Stanley Andrews
Emperor Mena
Acting
Richard Alexander
Navigator (archive footage)
Acting
King Baggot
Dr. Pierce
Acting
J. Frank Glendon
Speaker at Conference
Acting
Al Ferguson
Guard of Mu
Acting
Eric Mayne
Doctor at Conference
Acting
J.P. McGowan
Freighter Captain
Acting
Charles Murphy
Grubb, Freighter's Mate
Acting
Eddie Parker
Emperor's Guard / Mu Sentry
Acting
Buddy Roosevelt
Batu
Acting
Hal Taliaferro
Lancer Officer-in-Charge
Acting
Gwendolyn Logan
Mrs. Henry Andrews
Acting
H. Burroughs
Kutu
Acting