This two-hour special exploring the history and pre-school educational Muppet magic of the beloved PBS children's series is filled with quirky delights, including never-before-seen footage of the original "Sesame Street" pilot from the landmark series that first went on the air in 1969, and fascinating behind-the-scenes encounters with various Muppeteers, including Big Bird's human alter ego, Carroll Spinney, and the gentle, witty man behind Elmo, Kevin Clash, as they rehearse and work.