Guest Stars Nathan Fillion as Alien Interrogator Co Starring Nolan North voices Additional Voices Kari Wahlgren voices Additional Voices Brandon Johnson voices Mr. Goldenfold Maurice LaMarche voices Additional Voices Dan Harmon voices Birdperson Cassie Steele voices Tammy Gueterman Tom Kenny voices Additional Voices Tom Kenny voices Federation Admiral Tom Kenny voices Conroy Dan Harmon voices McDonald's Employee Maurice LaMarche voices Federation President Maurice LaMarche voices Gromflomite Engineer Nolan North voices Gromflomite Soldier Nolan North voices Gromflomite Commander Kari Wahlgren voices Diane Sanchez Brandon Johnson voices Federation Personnel