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 PeppardPete
Mary Tyler MooreLiz
Dom DeLuiseJ. Gardner Monroe
John McMartinThe Mayor
Nathaniel FreyConrad
Charles LaneDr. ShapiroJeanne ArnoldGertrude
George FurthMurgatroydMorty GuntySgt. GuntyJoe PonazeckiOfficer Ponazecki
Frank CampanellaCaptain Wallace
Susan Saint JamesAida
Don StroudBarneyNat Polen
Thelma RitterMrs. Schwartz
