| Stephen Fry | ... | Himself - Presenter | |
| rest of cast listed alphabetically: | |||
| Jean Berko Gleason | ... | Herself | |
| Zaha Bustami | ... | Herself - Interpreter, United Nations | |
| Joe Devlin | ... | Himself - Wellcome Trust | |
| Wolfgang Enard | ... | Himself - Max Planck Institute | |
| Wolfgang Klein | ... | Himself - Max Planck Institute for Psycholinguistics | |
| Robert McCrum | ... | Himself | |
| Steven Pinker | ... | Himself | |
| Cathy Price | ... | Herself - Wellcome Trust Centre for Neuroimaging | |
| Deb Roy | ... | Himself - Massachusetts Institute of Technology | |
| d'Armond Speers | ... | Himself - Klingon Language Institute | |
| Michael Tomasello | ... | Himself - Max Planck Institute | |
| Hugh Laurie | ... | Various (archive footage) (uncredited) | |
| Episode Crew |
Directed by | |||
| John-Paul Davidson | (as John Paul Davidson) | ||
Writing credits(in alphabetical order) | ||
| Stephen Fry | written by | |
Produced by | |||
| Mark Bell | .... | executive producer: BBC | |
| Gina Carter | .... | executive producer | |
| John-Paul Davidson | .... | series producer (as John Paul Davidson) | |
| Annie Macnee | .... | associate producer | |
| Lucy Wallace | .... | associate producer | |
Original Music by | |||
| Debbie Wiseman | |||
Cinematography by | |||
| Simon French | (director of photography) (as Simon Ffrench) | ||
Film Editing by | |||
| Masahiro Hirakubo | |||
Production Management | |||
| Lucy Tate | .... | production manager | |
Sound Department | |||
| Pietro Dalmasso | .... | dubbing mixer | |
| Sean O'Neil | .... | sound recordist | |
| Adam Toy | .... | sound recordist | |
Visual Effects by | |||
| Amber Ducker | .... | vfx production coordinator | |
| Katrin Geilhausen | .... | visual effects artist | |
| Rob Harvey | .... | visual effects supervisor | |
| Michelle Martin | .... | visual effects producer | |
| Tim Zaccheo | .... | visual effects supervisor | |
Editorial Department | |||
| Enge Gray | .... | colorist | |
| David Grewal | .... | on-line editor | |
Music Department | |||
| Steve Price | .... | music engineer/mixer | |
Other crew | |||
| Andrew Georgiou | .... | production accountant | |
| Sara Ramsden | .... | script consultant | |
| Zoë Rocha | .... | head of production (as Zoe Rocha) | |
Thanks | |||
| Tony Barrett | .... | thanks (as Father Tony Barrett) | |
| Louis Davidson | .... | thanks | |
| Arika Okrent | .... | thanks | |
| Main series | Episode guide | Full cast and crew |
| Company credits | IMDb TV section | IMDb Documentary section |