Arnold was released in the year 1978。Arnold is also called as "Diff'rent Strokes", Mio amico Arnold, Harlem contro Manhattan, Arnold et Willy, Arnold bouya wa ninkimono, 45 Minutes from Harlem。

Phillip Drummond, a widowed Manhattan millionaire and president of the mega-firm Trans Allied Inc., adopts two orphaned black brothers from Harlem 8-year-old Arnold and 12-year-old Willis. Drummond had made a promise to their dying mother and his housekeeper that he would care for the Arnold and Willis after she passes on; their father had died years earlier. The boys, whom Drummond always introduced as his two sons, went from rags to riches literally overnight. At first, Willis was a bit skeptical of their newfound wealth, but eventually, both he and Arnold felt right at home in their newfound surroundings. Also part of the family were Drummond's beautiful daughter, 13-year-old Kimberly; and his current housekeeper, Edna Garrett. As the years passed, Mrs. Garrett left to become house-mother at the Eastland School for Girls; she was replaced by the cantankerous Adelaide Brubaker and still later, charming Pearl Gallagher. Arnold's friends, Dudley and Robbie (and later, Charlie); Willis' girlfriend, Charlene; cast members from "The Facts of Life"; and Drummond's sister, Sophia, were frequently seen. In early 1984, Drummond found true love, marrying fitness instructor Maggie McKinney; she had a 6-year-old son, Sam. While most shows revolved around the typical lessons of growing up, some were quite serious (including a frightening encounter with a child molester and a memorable episode dealing with drug abuse guest starring First Lady Nancy Reagan).

Arnold actors and actresses include Charlotte Rae, Conrad Bain, Dana Plato, McLean Stevenson, Robert Jayne, Shavar Ross, Todd Bridges。