Set decades earlier than "The Big Bang Theory," the show follows the youth of a nine-year-old Sheldon Cooper going to high school. Jim Parsons, who plays, uh, "old" Sheldon on "The Big Bang Theory," narrates the episodes.
At the heart of the show is a nine-year-old actor who's a bit of a prodigy himself. He's not a physicist, but Iain Armitage already has an impressive resume.
Here are seven things you need to know about the star of "Young Sheldon."
For the past few years, Armitage has been running a YouTube channel where he discusses different plays and reviews them. He also reprises some songs from the musicals he watches. He goes under the moniker "IainLovesTheatre."
"I had to wait for seven hours to get tickets," he said of "Hamilton," which he caught at an early run at the Public Theater. "It is one of the most tremendous, amazing, fantastic — better than fantastic — shows ever."
Acting is nice and all, but Armitage wants to be the next David Copperfield or Criss Angel.
"I have a tablet filled with magic tricks, to the very brim," he said in an interview with Vulture. "I love magic. I think I want to be a magician in Las Vegas when I grow up."
Both of his parents are theater people.
Euan Morton, Armitage's father, in 2004.
Paul Hawthorne/Getty Images
One of the reasons why Armitage is able to see so many shows is because both of his parents work in theater. He's the son of Tony-nominated actor Euan Morton and the Broadway producer Lee Armitage.
He starred as Ziggy Chapman on "Big Little Lies."
Armitage and Shailene Woodley in "Big Little Lies."
HBO
A lot of people first got acquainted with Armitage when he starred on the Emmy Award-winning miniseries "Big Little Lies" on HBO earlier this year. On the show, he played Ziggy Chapman, a troubled kid who moves into town with his mother, Shailene Woodley. He's accused of hitting another girl in the class, which sets off a chain of dramatic events throughout the show. Armitage's performance was one of the highlights of the season.
He got his big break while dressed up as the Phantom of the Opera.
Armitage on the Tony Awards red carpet in 2016.
Larry Busacca/Getty Images for Tony Awards Productions
The actor started his career after an agent, Jamie Pillet, saw his YouTube channel. In his first meeting with Pillet in 2014, Armitage was dressed up as the Phantom of the Opera, according to The New York Times, because he was in town to see the show.
He was also on "Law & Order: Special Victims Unit," just like every other actor in Hollywood.
Iain Armitage in the "Law and Order: Special Victims Unit" episode "Chasing Theo."
NBC
Being cast on "Law & Order" is a time-worn tradition for every actor in Hollywood and an important stepping stone. Armitage starred on an episode that aired in January, playing a kidnapped child.
Jim Parsons is a huge fan.
Jim Parsons and Iain Armitage presenting at the 2017 Emmy Awards.
Phil McCarten/Invision for the Television Academy/AP Images
What does Old Sheldon think about Young Sheldon? He is, unsurprisingly, an admirer.
"Watching Iain bring this young version of this character to life that I’ve been working on for a decade of my own life, it was really moving," Parsons told Entertainment Weekly. "I felt such a sympathy for this little guy. It was kind of mind-blowing to see him brought to life through Iain."
