| Cast overview: |
 | Jim Carter | - | Himself - Narrator (voice) |
 | Hugh Hunt | - | Himself - Lead Engineer (as Dr Hugh Hunt) |
| Arnie Schreder | - | Himself - Pilot, Buffalo Airways |
 | Mikey McBryan | - | Himself - Manager, Buffalo Airways |
| Mary Stopes-Roe | - | Herself - Daughter of Barnes Wallis |
| Rick Donnelly | - | Himself - Dam Designer |
| Sidney Alford | - | Himself - Explosives Engineer (as Dr Sidney Alford) |
| Alfred Breland | - | Himself - Dam Co-Designer |
| Jim Bellavance | - | Himself - Dam Construction Engineer |
| Tod Todeschini | - | Himself - Launcher Designer |
 | George 'Johnny' Johnson | - | Himself - Bomb Aimer, 617 Squadron (as Johnny Johnson) |
| Ryan Beaubien | - | Himself - Aeronautics Engineer |
| Hilary Costello | - | Herself - PhD Student |
| Chuck Adams | - | Himself - Maintenance Engineer, Buffalo Airways |
| Alex Wagner | - | Himself - Co-Pilot, Buffalo Airways |
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