SHELDON GETS HELP READING PEOPLE'S FEELINGS WHEN HE BETA-TESTS AN EMOTION-DETECTING MACHINE, ON A REBROADCAST OF "THE BIG BANG THEORY," THURSDAY, DEC. 21

"The Emotion Detection Automation"- Sheldon beta-tests an MIT invention after hearing it can help him read people's emotions. Also, Leonard can't hide his feelings when Penny announces her brother is coming to town, and Raj invites his ex-girlfriends over to give him dating advice, on a rebroadcast of THE BIG BANG THEORY, Thursday, Dec. 21 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Laura Spencer, Katie Micucci, Alessandra Torresani and Katie Leclerc return as Raj's ex-girlfriends. (Originally broadcast 2/2/17.)

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:

Laura Spencer (Emily Sweeney)
Kate Micucci (Lucy)
Alessandra Torresani (Claire)
Katie Leclerc (Emily)

STORY BY: Chuck Lorre, Steven Molaro, Eric Kaplan

TELEPLAY BY: Steve Holland, Jim Reynolds, Saladin K. Patterson

DIRECTED BY: Mark Cendrowski