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 businessman and an amateur cartoonist, introduced him to drawing as a form of therapy. He became quite proficient, learning mostly on his own. Among his earliest influences were "Punch" cartoonist–illustrator Phil May, and American comic strip cartoonists Tad Dorgan, Cliff Sterrett, Rube Goldberg, Rudolph Dirks, Fred Opper, Billy DeBeck, George McManus and Milt Gross. At about this same time, Capp became a voracious reader. According to Capp's brother Elliot, Alfred had finished all of Shakespeare and George Bernard Shaw by the time he turned 13. Among his childhood favorites were Dickens, Smollett, Mark Twain, Booth Tarkington, and later, Robert Benchley