Other stars confirmed to appear include Dark Knight Rises actor Joseph Gordon-Levitt, Don Cheadle, Amy Ryan and Casey Affleck.
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Comics Melissa McCarthy and Steve Carell, Justified star Timothy Olyphant, Dax Shepard, Mario Lopez, The Office's Ed Helms, Kristen Bell and Paula Patton are lined up for cameos in the long-running children's series.
Sports stars taking part include LA Dodgers baseball ace Matt Kemp and NBA star Blake Griffin.
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Musical guests include Colbie Caillat, rapper Common and the band Train, who will duet with Elmo and The Count on a reworking of their hit 'Drive By', re-titled for the show, 'Five By'.
The season will also feature spoofs of British period drama Downton Abbey (retitled Upside Downton Abbey) and The Voice, which will feature the muppets mistaking bodily noises for voices.
