Blue's Clues, Bear in the Big Blue House, The Hoobs and Bubble Guppies/Number of the Day 20 (from Sesame Street)

Cast

 * Mailbox (from Blue's Clues) as Count Von Count
 * Bear (from Bear in the Big Blue House), Blue (from Blue's Clues), Gil (from Bubble Guppies), Molly (from Bubble Guppies), Ojo (from Bear in the Big Blue House), Iver (from The Hoobs), Groove (from The Hoobs), Tula (from The Hoobs), Deema (from Bubble Guppies), Steve (from Blue's Clues), Treelo (from Bear in the Big Blue House), Periwinkle (from Blue's Clues), Roma (from The Hoobs), Tutter (from Bear in the Big Blue House), Mr. Salt (from Blue's Clues), Mrs. Pepper (from Blue's Clues), Nonny (from Bubble Guppies), Hubba Hubba (from The Hoobs), Magenta (from Blue's Clues) and Oona (from Bubble Guppies) as Pipe Organ