"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
Sheryl Deauville
Assistant Costume Designer
Gordon Cornell Layne
Associate Producer
Ernesto Caparrós
Cinematography
Alma Macrorie
Editor
Henry Bumstead
Art Direction
Alexander Golitzen
John McCarthy Jr.
Set Decoration
Dorcy Howard
Colleen Callaghan
Key Hair Stylist
Larry Germain
Hairstylist
Bud Westmore
Makeup Supervisor
Donald Roberts
Assistant Director
Jim Shields
Sound
Waldon O. Watson
Joseph Gershenson
Music Supervisor
Vincent McHugh
Novel
George Seaton
Screenstory
Robert Pirosh
Screenplay
Edith Head
Costume Design
Director
Producer
Frank De Vol
Original Music Composer