Dr. John Holden
Joanna Harrington
Dr. Julian Karswell
Professor Henry Harrington
Mrs. Karswell
Professor Mark O'Brien
Mr. Meek
Lloyd Williamson
Professor K.T. Kumar
Mrs. Meek
Rand Hobart
Inspector Mottrarn
Detective Simmons
Superintendent
Chemist
Librarian
Mrs. Hobart
Farmer
Air Hostess
Hobart's Brother
Acting
