The Day of the Dolphin was released in the year 1973。The Day of the Dolphin is also called as Tag der Delphine, Operation Alpha, Operaatio Alfa, Jour du dauphin, Giorno del delfino, Dzien delfina, Dia do Golfinho, Día del delfín。
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.