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.
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Robert Urich
Dr. William Nugent
Maureen Reagan
Dr. Christine Scofield
Jack Hogan
Dr. Edward Grey
Jed Allan
Dick Rawdon
Alfred Ryder
Dr. Al Marsdan
Harry Townes
Dr. Burkhart
Lillian Lehman
Resident Doctor
Corinne Camacho
Ruth Conoyer
Anne Whitfield
Mrs. Vanier
Jackie Coogan
Roger
David Lewis
Dave
Tom Scott
Leonard Pitt
