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