While browsing the library, Elmo returns to the street with several books, including one called Once Upon a Monster. Cookie Monster has fond memories of the book and they both enter it magically. Inside, they find that not everything is as great as Cookie remembered and help all the monsters in the story with their problems. The levels in the game are defined as chapters in the book.
Chapter One: "The Greatest Party There Ever Wasn't"
Cookie and Elmo discover Marco's birthday party, which consists of only himself. Elmo and Marco go off to get supplies, while Cookie Monster goes for food. Elmo and Marco collect streamers in the Electric Jungle, discovering a hole to a secret cove. In the cove, the two help Seamus, and even Marco, pick out an outfit to wear for the party. Meanwhile, Cookie and Grover use the leaves of the Tree of Plenty to fly up said tree and collect fruit. They then run into Tallulah and help her make a birthday song. All the monsters come tog...
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