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 initially gave him a free hand in an extended daily sequence (about a biker named "Frankie," a caricature of Frazetta) to experiment with the basic look of the strip by adding a bit more realism and detail (particularly to the inking). After editors complained about the stylistic changes, the strip's previous look was restored. During most of his tenure with Capp, Frazetta's primary responsibility—along with various specialty art, such as a series of "Li'l Abner" greeting cards—was tight-penciling the Sunday pages from studio roughs. This work was collected by Dark Horse Comics in a four-volume hardcover series entitled "Al Capp's