Elmo's Little Glowworm is a 1994 Sesame Street "Random House Glowback Book", with some pieces of the illustrations printed in phosphorescent ink that glows in the dark. In the book, Elmo looks all over Sesame Street for his pet glowworm. He checks out Big Bird's nest, Hooper's Store, Oscar's trash can, the Count's Castle and the playground, before returning to his apartment. At the end of the book, readers can turn out the light to find Elmo's glowworm glowing on the pages.