Will Kuluva

as Grandfather Milo (1 episode)

as Louis Pasteur

as (voice)

as Melzar (4 episodes)

as Mr. Serpico

as Dr. Wolff

as Charlie Kingman (25 episodes)

as Professor Estabrook

as Yuko Takuma (1 episode), as Philip Lo (1 episode)

as Zoltan (1 episode)

as Mr. Thaler, Thrush Boss

as Edmund Constantine (1 episode), as Rudolf Kurtz (1 episode), as Premier Miguel Fuego (1 episode)

as Smerlov (1 episode)

as Mr. Allison

as Dr. Hans Von Etske (1 episode)

as Lars Christian (1 episode)

as Dr. Sordjano

as Argus Diavolos

as Bacco

as Frank Genna (1 episode), as Ray 'Goose' Gander (1 episode)

as Felix Ducotel (1 episode)

as General De Cruz (1 episode), as Mr. Ferguson (1 episode)

as Homer Doubleday (1 episode)

as Arab (1 episode)

as Mr. Gioia