Sesame Street Stays Up Late/Gravity Falls

Cast

 * Big Bird as Dipper
 * Prairie Dawn as Mabel
 * Cookie Monster as Grunkle Stan
 * Telly Monster as Soos
 * Zoe as Wendy
 * Moishe Oofnik as Li'l Gideon
 * Mrs. Grouch as Pacifia
 * Snuffy as Old Man McGucket
 * Grover as Robbie
 * Tiffy as Candy
 * Rosita as Grenda
 * Count von Count as Grunkle Ford
 * Elmo as Mermando
 * Wolfgang the Seal as Waddles
 * Elmo-noske as Gompers
 * Uncle Hank as Summerween Trickster
 * Oscar the Grouch as Bill Cipher
 * and more