Special Guest Stars Eva Marie Saint voices Katara Guest Stars Jeff Bennett voices Shiro Shinobi Logan Wells voices Meelo Darcy Rose Byrnes voices Ikki Lance Henriksen voices Lieutenant Carlos Alazraqui voices Protestor Tom Kenny voices referee Stephen Root voices Hobo Cora Baker voices 4-year-old Korra Maria Bamford voices Pema; Fan Girl Stephen Root voices Phonograph Vendor Stephen Root voices White Lotus Leader Sean Gantka voices Hasook Richard Epcar voices Captain Saikhan; Firebender Gangster