Only ET has your exclusive sneak peek of 'The Big Bang Theory' season 11 finale airing Thursday, May 10 at 8 p.m ET/PT on CBS.
O'Connell makes his debut as Sheldon's estranged older brother on Thursday's episode of the CBS hit show.
ET was exclusively on set for the making of his star-studded (and at times, dangerous) 'Crosswalk: The Musical.'
ET spoke to the actor at the 29th Annual GLADD Media Awards on Thursday, where he was honored with the Stephen K. Kolzak Award.
The 'Big Bang Theory' star gets candid about her first marriage in the May issue of 'Cosmopolitan.'
ET caught up with the cast at the Paleyfest, where they opened up about whether next year could be it for the hit show.
Jim Parsons, Kaley Cuoco, Johnny Galecki and more 'Big Bang' stars are dishing to ET about Shamy's big day!
'The Big Bang Theory' actor opened up about his character's younger counterpart at a PaleyFest panel on Wednesday.
The cast and creators attended a PaleyFest panel on Wednesday.
The theoretical physicist passed away at the age of 76.
ET caught up with the 32-year-old actress at the Paw Works Ties and Tails Gala, where she revealed details about Sheldon and Amy's upcoming wedding.
Howard and Bernadette are parents… again!
Here comes… the Coopers!
Bill Gates is headed to 'The Big Bang Theory,' but he's got some violent history with Sheldon!