The House in the Square (1951)

In all of time it's never happened before ... of all the lovers since the world began it's only happened to us !

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.