"A new infection that simply makes people feel happy is treated as a threat by the authorities while its "victims" work to spread it to others."
George Peppard
as Pete
Mary Tyler Moore
as Liz
Dom DeLuise
as J. Gardner Monroe
John McMartin
as The Mayor
Nathaniel Frey
as Conrad
Charles Lane
as Dr. Shapiro
Jeanne Arnold
as Gertrude
George Furth
as Murgatroyd
Morty Gunty
as Sgt. Gunty
Joe Ponazecki
as Officer Ponazecki
Frank Campanella
as Captain Wallace
Susan Saint James
as Aida
Don Stroud
as Barney
Nat Polen
as
Thelma Ritter
as Mrs. Schwartz
Franklin Cover
as Medical Expert
Cleavon Little
as Phil
James Noble
as Board Member
Paul Dooley
as Vic
Salem Ludwig
as Witter
Gordon Cornell Layne
Associate Producer
Colleen Callaghan
Key Hair Stylist
Henry Bumstead
Art Direction
Dorcy Howard
Set Decoration
Jim Shields
Sound
Sheryl Deauville
Assistant Costume Designer
Frank De Vol
Music
Alexander Golitzen
John McCarthy Jr.
Bud Westmore
Makeup Supervisor
Ernesto Caparrós
Cinematography
Larry Germain
Hairstylist
Donald Roberts
Assistant Director
Alma Macrorie
Editor
Vincent McHugh
Novel
Waldon O. Watson
Joseph Gershenson
Music Supervisor
George Seaton
Screenstory
Robert Pirosh
Screenplay
Edith Head
Costume Design
Producer
Director