Guest Stars Sagan McMahan voices The Pupa Rob Schrab voices Principal Cooke Natalie Morales voices CPS Agent #2 Natalie Morales voices Stacy K's Friend Tom Kenny voices Sly Stallone Tom Kenny voices Principal Cooke's Dad Tom Kenny voices Cooke's Temper Monster Tom Kenny voices Scientist Tom Kenny voices Tour Guide Kari Wahlgren voices Dr. Weatherstone Kari Wahlgren voices Theta 5 Kari Wahlgren voices Belinda Amanda Leighton voices Stacy K. Rob Schrab voices Officer Clark Keith Silverstein voices Jim