该电影由迈克·尼科尔斯执导，乔治·C·斯科特、翠施·范·德沃尔、保罗·索维诺等主演，于1973年上映。在105分钟的叙事中，《海豚之日》（又名：海豚妙破间谍网）Dr Jake Terrell, who has been training a pair of dolphins for many years, has had a breakthrough. He has taught his dolphins to speak and understand English, although they do have a limited vocabulary. When the dolphins are stolen, he discovers they’re to be used in an assassination attempt. Now he is in a race to discover who is the target, and where the dolphins are, before the attempt is carried out