SERVICE WITH A STAR -- Actor Jim Belushi's 1983 Sugar or Plain? SONG THE WEEK -- A look at a little known singing performance by actor Val Kilmer. MAGICAL PERFORMANCES -- Funnyman Steve Martin's magic act on The Smothers Brothers Comedy Hour. GUESS WHO? -- Audience members are challenged to identify clips with Suzanne Somers and Lorenzo Lamas. AS THE STAR TURNS -- Actor Wesley Snipes on a 1984 episode of All My Children. JOKE OF THE WEEK -- A peek at Rosie O'Donnell's 1979 stand-up comedy act. BEFORE THEY WERE STARS YEARBOOK -- A look back at the high school yearbook photos of Bette Midler, Sylvester Stallone and Richard Gere. STAR ANECDOTE -- Actor John Ritter reflects on an early TV role. FIRST FILMS -- Superstar Kevin Costner's 1974 appearance in Sizzle Beach. HAIR -- A look at hair commercials by Shelley Long, Laura Leighton, Jaclyn Smith and Jeff Daniels. ROLE MODELS -- Actress Jennifer Aniston's shows up in the 1992 sketch comedy series, The Edge. MAILBAG -- Scott Baio answers qu