KOOTHRAPPALI FACES A THREAT TO HIS CUSHY LIFESTYLE WHEN HE IS CUT OFF FROM THE FAMILY FORTUNE, ON "THE BIG BANG THEORY," THURSDAY, APRIL 23

"The Graduation Transmission" - Wolowitz questions his engineering abilities when he and Sheldon can't get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his former high school, and Raj pits his parents against each other when his father cuts him off financially, on THE BIG BANG THEORY, Thursday, April 23 (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:

Brian George (Dr. Koothrapali)
Alice Amter (Mrs. Koothrapali)

GUEST CAST:

Robert Clotworthy (Headmaster Edwards)
Matt Mittelman (Tech Support, V.O)
Katherine Von Till (Tech Support, V.O Recording)

WRITTEN BY: Chuck Lorre, Dave Goetsch and Anthony Del Broccolo

TELEPLAY BY: Steven Molaro, Steve Holland and Eric Kaplan

DIRECTED BY: Anthony Rich