“Young Sheldon,” the CBS prequel to “The Big Bang Theory” will arrive this fall, the network announced Monday. The prequel to TV’s top-rated comedy will follow the life of young Sheldon Cooper, age 9, growing up in Texas.

CBS said Sheldon will be played by Iain Armitage. He’s familiar to viewers of HBO’s “Big Little Lies,” as Ziggy Chapman, the son of single mom Jane Chapman (Shailene Woodley).

In addition, CBS said the show will be single camera as opposed to multicamera. “TBBT” is multicamera, as most CBS sitcoms are. The prequel therefore promises to be significantly different in tone and style from the hit from which it will spring. Jim Parsons will narrate as an adult Sheldon, calling to mind other famous single camera comedy narrators like Ron Howard (“Arrested Development”) and Daniel Stern (“The Wonder Years”).

The network offered few other details, except to note that “the series follows ‘The Big Bang Theory’s’ Sheldon Cooper at the age of 9, living with his family in East Texas and going to high school.” Other actors attached are Zoe Perry (who starred in the short-lived ABC drama, “The Family,” and is the real-life daughter of Laurie Metcalf, who has played Sheldon’s mom in “TBBT”), Lance Barber (who’s had a recurring role on “It’s Always Sunny in Philadelphia”), Raegan Revord (who also appeared briefly in “Modern Family”) and newcomer Montana Jordan.

Actor and prolific filmmaker Jon Favreau will direct the series’ pilot, but he will not have an on-screen role. (Series creator Chuck Lorre is executive producer, while Parsons will also share an EP credit.)

This prequel would already appear to have a large amount of back story, simply because so much is already known about Sheldon Cooper’s (Parsons) past — that he was raised in Texas, had a close relationship with his grandfather (“Pop-pop”), and was a child prodigy. CBS did not say when or where the show will launch.