WOLOWITZ IS SHOCKED WHEN A MAN CLAIMING TO BE HIS HALF-BROTHER SHOWS UP AT THE FRONT DOOR, ON "THE BIG BANG THEORY," THURSDAY, APRIL 9

Kevin Smith, Matt Bennett and Wil Wheaton Guest Star

"The Fortification Implementation" - When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Wolowitz meets the half-brother he never knew he had, and when Penny is invited to appear on Wil Wheaton's podcast, she and Leonard have a huge, on-air argument, on THE BIG BANG THEORY, Thursday, April 9 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

REGULAR CAST

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

RECURRING CAST:

Wil Wheaton (Himself)

GUEST CAST:

Matt Bennett (Josh)
Kevin Smith (Himself, V.O)
Rena Strober (Caller, V.O)

WRITTEN BY: Jim Reynolds, Saladin Patterson, Tara Hernandez

TELEPLAY BY: Steven Molaro, Steve Holland, Maria Ferrari

DIRECTED BY: Mark Cendrowski