Walter (1982)

A man with learning difficulties suffers neglect and ill-treatment, and this is only exasperated when his parents die and nobody seems to know what to do with him. A sequel to this film, titled "Walter and June", was released in 1983 and set 19 years later in time. In the United States, these two are sometimes bundled together under the title "Loving Walter".

Unfortunately the movie Walter is not yet available on HBO Max.