Edna Murphy

Corinne Grant

Charley Chase

Glen Harper

Hayford Hobbs

Donald Bartlett

William F. Moran

Dr. Philip Markham

Scott Pembroke

Dr. Harrison

William Gillespie

John Dryden

Glenn Tryon

Reporter

Ray Myers

Clinton Hodge

Colin Kenny

Stanley Fleming

Eddie Baker

Jack Reynolds (as Ed Baker)

Fred McPherson

Professor Comstock

Frank Lackteen

Malay George

Sam Lufkin

Sam Comstock

Fong Wong

Oracle of the Sands