| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 John Mullen | Crew | Directing | Director | 1 |
Jacqui Farnham | Crew | Directing | Director | 1 |
Bertrand Russell | Cast | Actor | Self (archive footage) | 1 |
 David Attenborough | Cast | Actor | Self | 2 |
 David Hare | Cast | Actor | Self | 1 |
 Germaine Greer | Cast | Actress | Self | 1 |
 Jane Goodall | Cast | Actress | Self | 1 |
 Kenneth Clark | Cast | Actor | Self (archive footage) | 1 |
Leonard Woolf | Cast | Self (archive footage) | 1 | |
 Milton Friedman | Cast | Actor | Self | 1 |
 Rebecca Front | Cast | Actress | Narrator | 3 |
 Susan Sontag | Cast | Actress | Self (archive footage) | 1 |
 Tariq Ali | Cast | Actor | Author | 1 |
R.D. Laing | Cast | Actor | Self (archive footage) | 1 |
 Richard Dawkins | Cast | Actor | Self | 1 |
Tanya Byron | Cast | Self | 1 | |
 Sigmund Freud | Cast | Actor | Self (archive footage) | 1 |
 Carl Jung | Cast | Actor | Self (archive footage) | 1 |
Lisa Appignanesi | Cast | Self | 1 | |
Jean Seaton | Cast | Self | 1 | |
 David Miliband | Cast | Actor | Self | 1 |
 Stanley Milgram | Cast | Actor | Self (archive footage) | 1 |
Friedrich von Hayek | Cast | Self (archive footage) | 1 | |
| Person | Type | Job | Role(s) | Episodes |
