On this third volume of the hit 1970s variety series, legendary comedienne Lily Tomlin -- appearing just after her triumphant stint on Laugh-In -- stars as The Health Nut. Pop singer Bobby Darin also joins in the fun, playing a man who reunites with an old classmate. And, of course, there is show regular Geraldine, who engages in a comic flirtation with boxing great Muhammed Ali. Football star turned actor Jim Brown also makes an appearance and, last but not least, the incomparable Johnny Cash gives a classic musical performance.