Frankenstein is probably the first science fiction story. One surprising thing is that Frankenstein was written almost two hundred years ago by a woman (Mary Shelley) who was only 18 years old.
Public domain image of Boris Karloff as Frankenstein's monster
Many different versions of Frankenstein are available (books, movies, plays, cartoons). The Speakaboos version below is for children. The beginning is very close to the original story, but Speakaboos changes the ending so that children will learn a good lesson and not be afraid.
More versions appear below: The 1931 movie is quite good: