Guest Stars Liza Koshy voices Veronica Hill Keith Ferguson voices Principal Funderberk Lauren Tom voices Ms. Jamanpour Lauren Tom voices Mrs. Maybank Diedrich Bader voices The Imposter Debra Wilson voices Mary Mitosis John Milhiser voices Chad Goldenboy Co Starring Debra Wilson voices Additional Voices Lauren Tom voices Additional Voices Keith Ferguson voices Additional Voices Liza Koshy voices Additional Voices Eric Bauza voices Additional Voices Diedrich Bader voices Additional Voices Raffael Ponce-Valencia voices Additional Voices Richie Moriarty voices Additional Voices John Milhiser voices Additional Voices