SHELDON KNOWS A SECRET ABOUT LEONARD AND PENNY, ON "THE BIG BANG THEORY," THURSDAY, OCT. 4

Editor's note: The end time for this episode has been changed.

"The Decoupling Fluctuation" - When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, in space, the other astronauts pick on Howard, on THE BIG BANG THEORY, Thursday, Oct. 4 (8:00-8:31 PM, ET/PT) on the CBS Television Network.

SERIES REGULARS:

Johnny Galecki (Leonard)
Jim Parsons (Sheldon)
Kaley Cuoco (Penny)
Simon Helberg (Wolowitz)
Kunal Nayyar (Koothrappali)
Melissa Rauch (Bernadette)
Mayim Bialik (Amy)

RECURRING CAST:

Kevin Sussman (Stuart)
Mike Massamino (Himself)
Pasha Lychnikoff (Dimitri)

STORY BY: Chuck Lorre, Jim Reynolds and Maria Ferrari

TELEPLAY BY: Steven Molaro, Eric Kaplan and Steve Holland

DIRECTED BY: Mark Cendrowski

RATING: To Be Announced