| Episode credited cast: |
 | Ben Miller | - | Himself - Presenter |
| Rest of cast listed alphabetically: |
 | Jim Al-Khalili | - | Himself |
| Peter Atkins | - | Himself - Oxford University |
| Janet Barlow | - | Herself - University of Reading |
| Hasok Chang | - | Himself - University College London |
| Michael de Podesta | - | Himself - National Physical Laboratory |
| Joanne Flanagan | - | Herself - Culham Centre for Fusion Energy (as Dr Joanne Flanagan) |
| William Fludgate | - | Himself - British Society of Scientific Glass Blowers |
| Graham Machin | - | Himself - National Physical Laboratory |
| Michael Pepper | - | Himself (as Professor Sir Michael Pepper) |
| David Spiegelhalter | - | Himself - University of Cambridge (as Prof David Spiegelhalter) |
| James Sumner | - | Himself - Manchester University (as Dr James Sumner) |
| Robert Taylor | - | Himself - Clarendon Laboratory |
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