THE GANG FLASHES BACK TO 2010 AS LEONARD TRIES TO REMEMBER WHERE HE KEPT A POTENTIALLY VALUABLE INVESTMENT, ON "THE BIG BANG THEORY," THURSDAY, NOV. 30

"The Bitcoin Entanglement" - Sheldon tries to teach the guys a lesson after they cut him out of a potentially valuable Bitcoin investment. Also, a seven-year-old video reveals a secret about Leonard and Penny's relationship, on THE BIG BANG THEORY, Thursday, Nov. 30 (8:00-8:31 PM, ET/PT) on the CBS Television Network.

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 Thomas Smith (Zack)

STORY BY: Steve Holland, Andy Gordon, Jeremy Howe

TELEPLAY BY: Dave Goetsch, Maria Ferrari, Anthony Del Broccolo

DIRECTED BY: Mark Cendrowski