The Briefest of Reviews from 1973

The movie was the absolute weirdest. George C. Scott plays this scientist (who is not a mad scientist) who has – and I mean this quite literally – taught a dolphin that he calls Alpha to speak English.

That's all well and good, really, except that The Day of the Dolphin is not a children's comedy. Instead, the movie is a rather intense political-style thriller. The dolphin and his dolphin girlfriend (you guessed it: Beta) are kidnapped... and then trained to kill the President of the United States.
You know, everyday stuff.