Atomic scientist Peter Standish travels back in time to 1784, an era he has read about in his forefather's diaries. He falls in love with his forefather's cousin, Helen, but his contemporaries of 1784 are perplexed by his strange talk and the odd knowledge he possesses.
| Actor | Role |
|---|---|
 Tyrone PowerPeter Standish | Peter Standish |
 Ann BlythHelen Pettigrew | Helen Pettigrew |
 Michael RennieRoger Forsyth | Roger Forsyth |
 Dennis PriceTom Pettigrew | Tom Pettigrew |
 Beatrice CampbellKate Pettigrew | Kate Pettigrew |
 Kathleen ByronDuchess of Devonshire | Duchess of Devonshire |
 Raymond HuntleyMr. Throstle | Mr. Throstle |
 Irene BrowneLady Anne Pettigrew | Lady Anne Pettigrew |