Special Guest Stars Foo Fighters as Themselves Guest Stars Kevin Clash voices Uncle Travelling Matt Dave Goelz as Uncle Travelling Matt Dan Garza as Junior Gorg Ben Durocher voices Junior Gorg Andy Heyward voices Pa Gorg Frank Meschkuleit as Pa Gorg John Tartaglia voices Sprocket Donna Kimball voices Cotterpin Kanja Chen voices Pogey Dave Goelz as World's Oldest Fraggle John Tartaglia voices Architect Frank Meschkuleit voices World's Oldest Fraggle Aymee Garcia voices Majory the Trash Heap Dan Garza voices Philo Karen Prell voices Icy Joe John Tartaglia voices Gunge Kira Hall voices Melody Merggle Aymee Garcia voices Bongo Kanja Chen voices Ferguson Merggle Co Starring Harvey Mason Jr. voices Background Singers Andrew Hey voices Background Singers Sam Ramirez voices Background Singers Britt Mason voices Background Singers Ana Krafchick voices Background Singers