STAGE TUBE: Sneak Peek - Tonight's Season Finale of THE BIG BANG THEORY

On tonight's fifth season finale of CBS's THE BIG BANG THEORY entitled "The Countdown Reflection", when Howard and Bernadette decide they want to be married before his NASA launch, the gang rushes to put on a wedding. The episode airs tonight, Thursday, May 10 (8:00-8:31 PM, ET/PT) on the CBS Television Network. NASA astronaut Mike Massimino guest stars as himself.

In THE BIG BANG THEORY, Leonard and Sheldon are brilliant physicists – wizards in the laboratory, but socially inept outside of it. Enter beautiful, free-spirited neighbor, Penny, who aims to teach them a thing or two about life.

While Leonard spends his days looking for love, Sheldon is quite content video-chatting with platonic partner Amy Farrah Fowler, or playing Star Trek 3D Chess with their ever-expanding universe of friends, including fellow scientists Koothrappali and Wolowitz, and Wolowitz’ fiancée, the adorable microbiologist, Bernadette.

Get a sneak peek at tonight's episode below!

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