Guest Star :: Rex Linn
Rex Linn has guest starred in 14 episodes of Young Sheldon.
101. Pilot as Principal Petersen
Aired September 25, 2017On his first day at the school, Sheldon's teachers are already complaining to Principal Petersen about their new student.
110. An Eagle Feather, a String Bean, and an Eskimo as Principal Petersen
Aired January 4, 2018When Principal Petersen worries that his school's curriculum is no longer challenging Sheldon, he suggests Mary and George consider sending him to a gifted school in Dallas.
113. A Sneeze, Detention, and Sissy Spacek as Principal Petersen
Aired February 1, 2018After Sheldon runs out of a class because his teacher sneezed, Principal Petersen calls George and Mary to his office to discuss the appropriate punishment.
116. Killer Asteroids, Oklahoma, and a Frizzy Hair Machine as Principal Petersen
Aired March 29, 2018Sheldon is sent to Principal Petersen's office after deliberately acting out after he didn't win the school science fair.
216. A Loaf of Bread and a Grand Old Flag as Principal Petersen
Aired February 21, 2019After Sheldon seems to back communism on the local news, Principal Petersen warns George that he could lose his job.
217. Albert Einstein and the Story of Another Mary as Principal Petersen
Aired March 7, 2019After finding out that Mary is expecting, George asks Principal Petersen for a raise.
218. A Perfect Score and a Bunsen Burner Marshmallow as Principal Petersen
Aired April 4, 2019After Principal Petersen calls Sheldon and George to his office, he tells them Sheldon got a perfect score on his PSAT.
219. A Political Campaign and a Candy Land Cheater as Principal Petersen
Aired April 25, 2019Sheldon goes to see Principal Petersen with a letter of complaint about the underfunded science department.
308. The Sin of Greed and a Chimichanga from Chi-Chi's as Principal Petersen
Aired November 21, 2019Fearful of losing his most valuable student, Principal Petersen pulls out all the stops to keep George and Sheldon at the school.
310. Teenager Soup and a Little Ball of Fib as Principal Petersen
Aired December 12, 2019Sheldon pleads with Principal Petersen to let him out of swim practice.
319. A House for Sale and Serious Woman Stuff as Principal Petersen
Aired April 2, 2020Sheldon approaches Principal Petersen to see if he would be interested in buying the house next door.
321. A Secret Letter and a Lowly Disc of Processed Meat as Principal Petersen
Aired April 30, 2020Principal Petersen appears on Sheldon's video to show support for him going to college.
401. Graduation as Principal Petersen
Aired November 5, 2020After graduating high school, Sheldon has a breakdown when he realizes he may not be ready for college. Also, Dale tries to make amends with Meemaw.
408. An Existential Crisis and a Bear That Makes Bubbles as Principal Petersen
Aired February 18, 2021Meemaw takes matters into her own hands when Sheldon's philosophy teacher, Professor Ericson (Melanie Lynskey), sends him into a tailspin. Also, George Sr. learns Georgie has been cutting class.