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Charly

Charly Gordon is an intellectually disabled man who lives in Boston. He has a desire to learn and has attended night school for two years, taking a class taught by Alice Kinnian. He learns to read and write, though his spelling and penmanship are poor and he is unable to spell his own name. He works as a janitor at a bakery, where his coworkers amuse themselves by taking advantage of his disability, and he enjoys playing with children at a playground.

Alice takes Charly to researchers Dr. Richard Nemur and Dr. Anna Straus, who have been investigating methods for increasing intelligence. Having successfully tested a surgical procedure on a lab mouse named Algernon, they are looking for a human test subject. They put Charly through a battery of aptitude tests and have him try to solve a series of paper mazes while Algernon runs through models of them. Charly consistently loses to Algernon, but is selected for the surgery.

After surgery, Charly loses to Algernon again and is frustrated at not immediately becoming smarter. After some time passes, he finally beats Algernon and his intelligence begins to increase. His coworkers tell him to operate a complex machine, hoping that he will break it so they can have the day off, but he successfully operates it. Embarrassed and frightened by his new intelligence, they persuade the bakery owners to fire Charly. Alice continues teaching him, but his intelligence continues to increase and eventually surpasses hers. Lacking emotional maturity, Charly becomes infatuated with Alice and confesses his love for her, but she sharply rejects his advances. He flees in an act of rebellion but eventually returns to Boston, and the two start to consider marriage.

Nemur and Straus present their research at a scientific convention. After playing the film of Charly's original aptitude tests, they bring him out for a question-and-answer session. He is now the intellectual equal or superior of everyone in the audience, but he has also developed a cynical view of humanity that the attendees mistake for humor. He reveals that Algernon has lost his enhanced intelligence and died, facts that the research team kept from him, and expects to undergo a similar decline. Fleeing the convention and seeing hallucinations of his previous self everywhere, Charly stops to help a busboy pick up a tray of dropped glasses after observing that he is intellectually disabled.

Charly overhears Alice, Nemur, and Straus discussing his situation and offers to assist in finding a way to preserve his intelligence, but their combined efforts prove fruitless. He falls into a depression and asks Alice never to visit him again. Some time later, Alice sees Charly playing with children on the playground, having fully regressed to his original level of disability.