SHELDON CHOOSES BETWEEN FOLLOWING THE RULES AND STAYING LOYAL TO HIS FRIENDS, ON "THE BIG BANG THEORY," THURSDAY, JAN. 31

"The Meteorite Manifestation" - Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law. Also, Leonard is disappointed when his friends exclude him from a scientific project, on THE BIG BANG THEORY, Thursday, Jan. 31 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Andy Daly guest stars as Nathan.

REGULAR CAST:

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

RECURRING CAST:

Kevin Sussman (Stuart)
Brian Posehn (Bert)
Lauren Lapkus (Denise)

GUEST CAST:

Andy Daly (Nathan)
Joel McCrary (Andy)
Minerva Garcia (Linda)

STORY BY: Chuck Lorre, Steve Holland, Maria Ferrari

TELEPLAY BY: Eric Kaplan, Tara Hernandez, Jeremy Howe

DIRECTED BY: Mark Cendrowski