DR. DE FORMER - 40 years old, pale and nervous, speaks in an intense tone at all times.
MR. GRAY - A small, humpbacked man with a beaked nose and a hawk-like face, half maniac, a drug addict, walks with a limp. Make this character as hideous as possible.
JASPER - Black, wears a white housecoat, black trousers and shoes.
INSPECTOR WISE - A heavy-set man, very intense at all times and extremely aggressive.
FRANK HOST - Juvenile type, intense and alert.
FLORENCE WALLER - Leading woman type.
THE STRANGER - Straight character.
THE BLUE GHOST - Tall, slender man, wears a blue ghost outfit like that of a monk's hooded garment, only in blue, also a hideous false face.