Conrad intoned a rhyming narration heard over the credits of the 1970 John Wayne film Western "Chisum". His voice is heard in the Clio Award-winning 1971 public-service announcement about pollution featuring Iron Eyes Cody, created for Earth Day by Keep America Beautiful and the Ad Council. From 1973 to 1978, Conrad narrated the TV nature program, "Wild, Wild World of Animals". Also during the 1970s, he appeared in and narrated a number of episodes for ABC's "American Sportsman", and in the CBS documentary "The Lost Treasure of the Concepcion". He later narrated "The Making of Star Wars" (1977), the disaster documentary "Catastrophe!" (1977), the 1978 World Series U.S.-baseball highlight film, "Buck Rogers in the 25th Century" (1979), and "The Rebels" (1979). He performed the role of Denethor in the 1980 animated TV version of J. R. R. Tolkien's "The Return of the King". His other voice work included narration for "The Highwayman" and the High Flight sign-off featuring an F-15.