Inspectors for the U.S. Public Health Service try to track down the cause of a rash of mysterious ailments suddenly appearing among the general populace.
Robert Urich
as Dr. William Nugent
Maureen Reagan
as Dr. Christine Scofield
Jack Hogan
as Dr. Edward Grey
Jed Allan
as Dick Rawdon
Alfred Ryder
as Dr. Al Marsdan
Harry Townes
as Dr. Burkhart
Lillian Lehman
as Resident Doctor
Corinne Camacho
as Ruth Conoyer
Anne Whitfield
as Mrs. Vanier
Jackie Coogan
as Roger
David Lewis
as Dave
Tom Scott
as Leonard Pitt
