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, 2020
When 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, 2021
Sheldon will leave no stone unturned to prove the IRS wrong after they claim he made a mistake on his family's tax return. Meanwhile, Dale is unhappy when his doctor asks him to get a colonoscopy.