| Episode credited cast: |
 | Bernard Hill | - | Himself - Narrator (voice) |
| Rest of cast listed alphabetically: |
 | Joseph Giaime | - | Himself - Observatory Head, LIGO (as Prof Joe Giaimi) |
 | Michio Kaku | - | Himself - The City College of New York (as Prof. Michio Kaku) |
| Andrei Linde | - | Himself - Stanford University (as Prof Andrei Linde) |
| Laura Mersini-Houghton | - | Herself - University of North Carolina (as Dr Laura Mersini-Houghton) |
| Bob Nichol | - | Himself - University of Portsmouth (as Prof Bob Nichol) |
| Roger Penrose | - | Himself - Oxford University (as Prof Sir Roger Penrose) |
| Param Singh | - | Himself - The Perimeter Institute (as Dr Param Singh) |
| Lee Smolin | - | Himself - The Perimeter Institute (as Prof Lee Smolin) |
| Neil Turok | - | Himself - The Perimeter Institute (as Prof Neil Turok) |
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