Charly on VHS. Starring Cliff Robertson, Claire Bloom. With Lilia Skala, Leon Janney, Ruth White, Dick Van Patten. Based on the novel Flowers for Algernon by Daniel Keyes. Directed by Ralph Nelson. 1968.
The VHS cover says:
Based on Daniel Keyes’ Flowers for Algernon, this is the story of Charly Gordon, a gentle man determined to learn. When a breakthrough neuro-surgical procedure is discovered, Charly agrees to try it, unaware that he will also encounter complex emotions for the first time in his life. Charting Charly’s development is his devoted caseworker who soon discovers along with Charly that the surgery’s effects may not last forever.
DVD Upgrade: Charly
Use Your Words: Flowers for Algernon Paperback by Daniel Keyes