Special Guest Stars Lily Tomlin voices Professor Fizzle Nathan Fillion voices Axle ValveStuck Martin Short voices Tony Tennelli Catherine O'Hara voices Teresina Tennelli Catherine O'Hara voices Aunt Tennelli Jay Baruchel voices Dr. Tillage Guest Stars Matthew Mintz voices Ralphie Birva Pandya voices Jyoti Miles Koseleci-Vieira voices Arnold Mikaela Blake voices Keesha Gabby Clarke voices Dorothy Ann Leke Maceda-Rustecki voices Carlos Lynsey Pham voices Wanda Co Starring Ana Sani voices Additional Voices Annelise Forbes voices Additional Voices Stuart Stone voices Additional Voices Lilly Bartlam voices Additional Voices Marcus Craig voices Additional Voices Martin Roach voices Additional Voices Kevin Vidal voices Additional Voices