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