as

Roy

as

Dr. Cygnus Layton

as

Dr. Bryant

as

Drake

as

Commodore Carlson

as

Captain Hornsby

as

Vero (uncredited)

as

Daniels (uncredited)

as

Man in Audience

as

John Greer

as

Brigadier General (uncredited)

as

Prof. Millard

as

Henry Mills

as

Dr. Bryant

as

M. De Treville

as

Swenson (uncredited)

as

Stage Actor Playing Philip Mannings

as

Prof. Millard

as

John Wheeler

as

Prof. James Clayton [Chs. 1, 10-12]

as

Commishioner Litchfield

as

Dr. George Strong

as

Mordigan

as

British Major

as

Cal Sutton

as

Interpreter (uncredited)

as

Winsley (uncredited)

as

Bismo - Annabella's Friend (uncredited)

as

Cavalier (uncredited)

as

Bidwell

as

Ace Diamond

as

Mr. Winters

as

Dr. Cyrus Layton

as

Commissioner Robert George Hardy [Chs. 5-7]

as

Major Morris

as

Ship's Radio Man (uncredited)

as

Guard (uncredited)

as

Ivan Shark

as

Joseph Rand

as

Lloyd Chapin

as

Thomas (uncredited)

as

Fire Warden

as

Officer (uncredited)

as

Instructor

as

Captain in Car (uncredited)

as

'Dandy' Darnell

as

Dan Slocum

as

Giovanni (Uncredited)

as

Abel Bellamy