A jewel thief has stolen a priceless diamond necklace from Lady Holiday (Dame Diana Rigg), and reporters Kermit the Frog, Fozzie Bear, and The Great Gonzo travel to England to interview Lady Holiday. Lady Holiday's new receptionist, Miss Piggy 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 thieves before they steal her most prized possession.
—simon