WHEN THEY WERE SQUARES -- This opening segment features Brett Butler, Ellen DeGeneres, Brad Pitt and Jerry Seinfeld as they appeared on the game show Hollywood Squares. JOKE OF THE WEEK -- A look back at an early stand-up comedy performance by Wayne's World and Saturday Night Live star Dana Carvey. STAR ANECDOTES -- Jeopardy's Alex Trebek looks back at an early TV appearance while a neighbor reminisces about singer/actress Dolly Parton. GUESS WHO? -- Audience members are challenged to recognize Suzanne Pleshette and Shannon Doherty. AS THE STAR TURNS -- Featuring Kevin Bacon's early appearance on The Guiding Light. BEFORE THEY WERE STARS YEARBOOK -- Old high school yearbook photos of Woody Harrelson, Luke Perry and Susan Sarandon. SONG OF THE WEEK -- A look back at actor Lou Gossett, Jr. performing a song in 1970. WHAT'S COOKIN' -- These early performances featuring food and stars include Emma Thompson, David Letterman and Jeff Daniels. YESTERDAY'S NEWS -- Comedian George Carlin in a 1