 A jewel thief has steals a priceless diamond necklace from Lady Holiday (Rigg), and reporters Kermit the Frog (Henson), Fozzie Bear (Oz) and Gonzo (Goelz) travel to England to interview. Lady Holiday s new receptionist, Miss Piggy (Oz) poses as the fashion designer, but Kermit soon finds out the truth, when another necklace is stolen. Instead of interviewing the  real  Lady Holiday, Kermit must track down the thief s before the steal her most prized possession.