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Photo Flash: First Look - THE BIG BANG THEORY's Season Finale, Airing 5/16


On THE BIG BANG THEORY's upcoming sixth season finale, titled "The Bon Voyage Reaction," a new success for Leonard makes Sheldon very jealous and throws Penny for a loop. Meanwhile, Koothrappali pushes Lucy too far in their relationship, on Thursday, May 16 (8:00 - 8:31 PM, ET/PT) on CBS.

Check out a first look below!

Photos by: Robert Voets/Warner Bros.

Simon Helberg, Melissa Rauch, Mayim Bialik, Jim Parsons, Johnny Galecki

Kunal Nayyar, Kate Micucci

Kaley Cuoco, Johnny Galecki

Kate Micucci, Mayim Bialik, Kunal Nayyar

Kate Micucci, Mayim Bialik, Kunal Nayyar

Jim Parsons, Kaley Cuoco

Kaley Cuoco, Kunal Nayyar

Kaley Cuoco, Kunal Nayyar

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