Jerry O'Connell will play Sheldon's brother on the CBS sitcom "The Big Bang Theory."
"The Big Bang Theory" confirmed O'Connell's casting on its official Twitter account Wednesday after producers announced the news at PaleyFest in Los Angeles.
"Breaking casting announcement: Sheldon's (adult) brother Georgie is going to be played by @MrJerryOC! #BigBangTheory #PaleyFest," the tweet reads.
O'Connell's Georgie will appear in a May episode that will feature Sheldon (Jim Parsons) and Amy Fowler's (Mayim Bialik) wedding, according to The Hollywood Reporter.
Producers also said Laurie Metcalf, who portrays Sheldon's mom on "Young Sheldon," will appear as Mary Cooper in the same episode.
"It was important for us," showrunner Steve Holland said.