407 - A Philosophy Class and Worms That Can Chase You
Aired Thursday, February 11, 2021

Sheldon’s first day of college is derailed by his new philosophy teacher, Professor Ericson (Melanie Lynskey). Also, Mary and Brenda (Melissa Peterman) live vicariously through Missy’s first day of middle school.
- Guest Stars:
- Ed Begley, Jr. as Dr. Linkletter
- Melissa Peterman as Brenda Sparks
- Wyatt McClure as Billy Sparks
- Melanie Lynskey as Professor Ericson
- P.J. Ochlan as Rene Descartes
- Writers (Story):
- Tara Hernandez
- Jeremy Howe
- Connor Kilpatrick
- Writers (Teleplay):
- Steven Molaro
- Steve Holland
- Eric Kaplan
- Director:
- Alex Reid