Guest Star :: John Mariano
John Mariano has guest starred in 2 episodes of Young Sheldon.
320. A Baby Tooth and the Egyptian God of Knowledge as Richard Feynman [v.o.]
Aired April 16, 2020When Sheldon is put under anesthetic at the dentist's office, he has a vision of a scientific breakthrough. Meanwhile, Dale leaves Georgie in charge of the store when he and Meemaw spend a weekend away.
Aired April 15, 2021When the IRS accuses Sheldon of making a mistake, he’ll stop at nothing to prove them wrong. Also, Dale is forced to get a colonoscopy and tries to convince Meemaw to join him.