SHELDON AND RAJ SEE IF THEY CAN SURVIVE INTENSE HEAT - AND EACH OTHER - WHEN THEY VENTURE DEEP UNDERGROUND IN THE NAME OF SCIENCE, ON A REBROADCAST OF "THE BIG BANG THEORY," AT A SPECIAL TIME, THURSDAY, APRIL 9

"The Expedition Approximation" - Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel. Meanwhile, Leonard and Penny seek advice from Wolowitz and Bernadette after they fight about money, on a rebroadcast of THE BIG BANG THEORY, at a special time, Thursday, April 9 (9:01-9:30 PM, ET/PT), on the CBS Television Network. (Originally broadcast 10/20/14.)

REGULAR CAST:

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

STORY BY: Steven Molaro, Dave Goetsch, Tara Hernandez

TELEPLAY BY: Jim Reynolds, Steve Holland, Maria Ferrari

DIRECTED BY: Mark Cendrowski