Al Capp veterans returning from the war. Capp was also involved with the Sister Kenny Foundation, which pioneered new treatments for polio in the 1940s. Serving in his capacity as honorary chairman, Capp made public appearances on its behalf for years, contributed free artwork for its annual fund-raising appeals, and entertained crippled and paraplegic children in children's hospitals with inspirational pep talks, humorous stories and sketches. In 1940, an RKO movie adaptation starred Granville Owen (later known as Jeff York) as Li'l Abner, with Buster Keaton taking the role of Lonesome Polecat, and featuring a title song with lyrics by Milton Berle.
Al Capp commentary, "Li'l Abner" is considered a classic of the genre. The comic strip stars Li'l Abner Yokum—the simple-minded, loutish but good-natured and eternally innocent hayseed who lives with his parents—scrawny but superhuman Mammy Yokum, and shiftless, childlike Pappy Yokum. "Yokum" was a combination of "yokel" and "hokum", although Capp established a deeper meaning for the name during a series of visits around 1965–1970 with comics historians George E. Turner and Michael H. Price. "It's phonetic Hebrew—that's what it is, all right—and that's what I was getting at with the name Yokum, more so than any attempt to sound "hickish,"" said