The Professor (voice)

Era (voice) (2 episodes)

The Cleaner (voice)

Manny (voice)

(1 episode)

(21 episodes)

Stickley Rickets (voice) (13 episodes)

Miles Warren / The Professor (voice) (2 episodes)

Julian Frey (voice) (1 episode)

Professor Jones (voice) (6 episodes)

(voice) (13 episodes)

Phineas Sharp (voice) (1 episode)

(13 episodes)

Sunflower (voice)

(13 episodes)

Grumblebee (voice)

Host

Count Blogg (voice)

Granger (1 episode)

(1 episode)

Lucifer (voice) (uncredited) (1 episode)

Lucifer (1 episode)

Lucifer (voice) (6 episodes)

Oz (uncredited) (voice)

Dr. Cropotkin

(15 episodes)

The Astrologer (1 episode)

Fagon (1 episode)

Uncle Martin (voice) (16 episodes)

Dr. Zachary Smith

(1 episode)

(1 episode)

Prof. Nicholas Porteus (1 episode)

Mr. Wortzel

Hollister (1 episode)

Mr. Benjamin (1 episode)

The Ambassador (1 episode)

Mr. Piper (1 episode)

(1 episode)

(2 episodes)

(19 episodes)

Athos (18 episodes)

Dr. Zachary Smith (83 episodes)

Paul Duval (1 episode)

Farnsworth (1 episode)

Charles Dickens (1 episode)

(42 episodes)

(1 episode)

George Alfred (1 episode)

Doctor (1 episode)

(77 episodes)

Lysias

(3 episodes)

Fritz Weiser (1 episode)

Popeau (1 episode)

Hong Kong Sam (1 episode)

Favier (1 episode)

Fouresh (1 episode)

Trapollini (1 episode)

(1 episode)

Lord Karsch (1 episode)

Tom Oakly

(3 episodes)

Courcelles (1 episode)

Matey (1 episode)

Legendre (1 episode)

Exton (1 episode)

Mr. Dickinson (1 episode)

Master of Ceremonies (1 episode)

Dr. Wetheril (1 episode)

Lord James O'Brien (1 episode)

(2 episodes)