The Smothers Brothers, Diahann Carroll, and Richard Kiley join host Carol Burnett in a series of skits and musical numbers. Sketches including Carol and Lyle performing exercises, the Smothers Brothers doing a sketch, singing `John Henry' and joined by Carol on `Pretoria', while Richard Kiley sings `The Impossible Dream', and Diahann Carroll sings `The Rules of the Road'.The Smothers Brothers, Diahann Carroll, and Richard Kiley join host Carol Burnett in a series of skits and musical numbers. Sketches including Carol and Lyle performing exercises, the Smothers Brothers doing a sketch, singing `John Henry' and joined by Carol on `Pretoria', while Richard Kiley sings `The Impossible Dream', and Diahann Carroll sings `The Rules of the Road'.