| John Cleese | ... | Himself - Presenter | |
| rest of cast listed alphabetically: | |||
| David Attenborough | ... | Himself | |
| Cynthia Breazeal | ... | Herself - Kismet Designer (as Dr. Cynthia Breazeal) | |
| Sybil Carrere | ... | Herself - Psychologist (as Dr. Sybil Carrere) | |
| Dan Deveney | ... | Himself | |
| Lauren Deveney | ... | Herself | |
| Sharon Deveney | ... | Herself | |
| Paul Ekman | ... | Himself (as Professor Paul Ekman) | |
| John Gottman | ... | Himself - Psychologist (as Professor John Gottman) | |
| Elizabeth Hurley | ... | Janet | |
| Mr. Kadokawa | ... | Himself - Smiling School Tutor | |
| Madan Kataria | ... | Himself (as Dr. Madan Kataria) | |
| Dacher Keltner | ... | Himself - Psychologist (as Dr. Dacher Keltner) | |
| Eden Kolk | ... | Himself | |
| Mandy Kolk | ... | Herself | |
| David Matsumoto | ... | Himself (as Prof. David Matsumoto) | |
| Chris Wilson | ... | Himself - Cambridge University Student | |
| Betty Ann Wong | ... | Herself | |
| Ronald Zuker | ... | Himself - Surgeon (as Dr. Ronald Zuker) | |
| Episode Crew |
Produced by | |||
| Michael J. Mosley | .... | executive producer (as Michael Mosley) | |
| Nicholas Rossiter | .... | executive producer | |
Cinematography by | |||
| Richard Numeroff | |||
Sound Department | |||
| Sean O'Neil | .... | sound mixer | |
Thanks | |||
| Chris Ashwin | .... | the BBC wishes to thank | |
| Paul Ekman | .... | the BBC wishes to thank (as Professor Paul Ekman) | |
| Suzanne Levy | .... | the BBC wishes to thank | |
| William Goldman | ... | Himself | |
| Adam Leese | ... | Various roles (uncredited) | |
| Katie Lohmann | ... | Face Model (uncredited) |
| Series Crew These people are regular crew members. Were they in this episode? |
Directed by | |||
| James Erskine | |||
| David Stewart | |||
Writing credits | ||
| John Cleese | ||
Produced by | |||
| James Erskine | .... | producer | |
| Sally George | .... | series producer | |
| Sharon Gillooly | .... | producer | |
| Nancy Lavin | .... | executive producer | |
| David Stewart | .... | producer | |
Cinematography by | |||
| Rajesh Bedi | |||
| Bill Broomfield | |||
| Patrick Duval | |||
| John Halliday | |||
| Chris Hartley | |||
| John Hooper | |||
| John Johnson | |||
| Allan Palmer | |||
| Jeremy Pollard | |||
| Nancy Schiesari | |||
Production Design by | |||
| Jill McGraw | |||
Art Direction by | |||
| Kiara Geller | |||
Sound Department | |||
| Tony Burke | .... | sound recordist | |
| Simon Firsht | .... | sound recordist | |
| Richard Jay | .... | boom operator | |
| Michael Keenan | .... | sound recordist | |
| Danny McCullough | .... | sound mixer | |
Camera and Electrical Department | |||
| Daniel Lightening | .... | assistant camera (2001) | |
| Andrew Medvitz | .... | dolly grip (2001) | |
Other crew | |||
| TC Kilpper | .... | production assistant (2001) | |
| Main series | Episode guide | Full cast and crew |
| IMDb TV section | IMDb Documentary section |