In the Young Sheldon episode “Demons, Sunday School, and Prime Numbers,” Mary (Zoe Perry) does not approve when she finds Sheldon (Iain Armitage) playing Dungeons and Dragons with his friends Tam (Ryan Phoung) and Billy (Wyatt McClure). So she sends the 9-year-old little genius to Sunday school which inspires Sheldon to study a variety of religions.
Billy’s father Herschel is portrayed by Billy Gardell. He’s known for his roles on Mike & Molly (cop Mike Biggs), My Name Is Earl (Officer Hoyne), Heist (Billy O’Brien), Yes, Dear (Billy Colavita), The Practice (Manny Quinn), and Judging Amy (Lyle Cooper), among others. Gardell was also the host of the TV game show Monopoly Millionaires’ Club. Young Sheldon airs Thursdays at 8:30pm on CBS, right after The Big Bang Theory.