515 - A Lobster, an Armadillo and a Way Bigger Number
Aired Thursday, March 3, 2022

Sheldon joins Dr. Linkletter (Ed Begley, Jr.) and Dr. Sturgis (Wallace Shawn) on a science road trip. Also, Georgie continues to lie about his age.
- Guest Stars:
- Wallace Shawn as Dr. John Sturgis
- Ed Begley, Jr. as Dr. Linkletter
- Craig T. Nelson as Dale
- Wendie Malick as President Hagemeyer
- Emily Osment as Mandy
- Stephanie Hodge as Pat
- Writers (Story):
- Steven Molaro
- Jeremy Howe
- Nick Bakay
- Writers (Teleplay):
- Steven Holland
- Eric Kaplan
- Marie Cheng
- Director:
- Alex Reid