Finding a curiously silent young runaway boy whose head has been completely shaved, small-town police call in a psychologist who discovers that the boy is a war orphan named Peter Fry. Peter tells the story of his life to the psychologist.
After staying with a series of neglectful aunts and uncles, he is sent to live with an understanding retired actor named Gramp. Peter starts attending school and begins living the life of a normal boy, until his class gets involved with trying to help war orphans in Europe and Asia.
Peter soon discovers that, like the children on the posters whose images haunt him, he too is a war orphan. The realization about his parents and the work helping the orphans makes Peter turn very serious, and he is further troubled when he overhears the adults around him talking about the world preparing for another war.
The next day, after having a bath, Peter is drying his hair with a towel when, to his astonishment, he sees that his hair has turned green. After being taunted by the townspeople and his peers, he runs away.
Suddenly, appearing before him in a lonely part of the woods, are the orphaned children whose pictures he saw on the posters. They tell him that while he is a war orphan, his green hair can make a difference and he must tell people that war is dangerous for children. He leaves determined to deliver this message to any and all.
Upon his return, the townspeople, upset about a boy who is now different, urge Gramp to encourage Peter to consider shaving his hair so that it might grow back normally. Peter returns to the woods looking for the orphan children from the posters, but is chased by a group of boys from school who attempt to cut his hair. He later decides to get his head shaved and the town barber does the job. However, Peter leaves home in the middle of the night, wearing a baseball cap and carrying a baseball bat.
Back in the present, Peter finishes his story. The psychologist tells him that when someone really believes something, they don’t run away. Peter leaves and is reunited with Gramp in the station’s waiting room. Gramp reads him a letter written by his father, intended for his 16th birthday. Peter’s father relates his beliefs about how some things are worth dying for, and if people forget, to “remind them, Peter.” Encouraged to keep sharing his message, Peter is sure that his hair will grow back in green again.
The psychologist tells Dr. Knudson that he does not care whether the boy’s hair was ever actually green or not, but that he agreed with what the boy had to say. Gramp and Peter go home.
Watch The Boy with Green Hair Full Movie to experience the emotional journey of Peter Fry and his message of peace and understanding in times of war.