It's possible that:
* The title is incorrect: There might be a typo in the title or a different spelling. Perhaps you meant "El pasado amenaza" with a different year.
* The movie is obscure: The movie could be a very obscure film that isn't well-documented online.
* You are thinking of a different movie: Maybe you are thinking of a movie with a similar plot or title.
Could you please provide more details about the movie you are looking for?