Mecha Elmo, Mecha Cookie Monster, and Mecha Abby find a giant pie sent by aliens! But why did they send it to Earth? Find out this and more in this Mecha Builders Episode Compilation!

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Welcome to Sesame Street! A colorful community of monsters, birds, grouches, and humans—a place where everyone counts. With a signature mix of laughter and learning, Sesame Street has been enriching minds and bringing families closer for five decades. Rigorously researched and deeply inclusive, Sesame Street has become the most-watched children’s program in history. For more fun games and videos for your preschooler in a safe, child-friendly environment, visit us at http://www.sesamestreet.org