Roy Gordon

as Dr. Frederick Ramsey

as Albright

as Paul Thompson

as Sen. Walder

as Dr. Raymond Cushing

as The President

as Dr. Loren Wright

as Richard V. Atherton (uncredited)

as Abbott

as Audubon

as Dr. Elmwood

as Doctor Colfax

as Jackland Ainsworth

as Benjamin Merrill (Uncredited)

as Walter Fletcher

as Col. Hatch