The Big Bang Theory Photo Preview: A Sheldon Shocker!

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Oh la la! Sheldon will be in for quite a surprise tonight. Will he be able to handle it?

Howard and Sheldon make it to Houston together in The Big Bang Theory season 7 episode 18. They take a break from their trip to pay Sheldon's mom a visit and it doesn't go well.

Not ... at ... all!

Sheldon's forced to acknowledge and accept a new reality. Howard's there by his side in a bedroom and in a bar. Hmm... 

Back at home, Raj throws a Mystery Murder dinner party with Stuart as the victim. That should be fun! Or not!

Check out the official photos. And, if you've missed any episodes, catch up now! Watch The Big Bang Theory online at TV Fanatic.

Did you hear the amazing news? CBS has renewed The Big Bang Theory for THREE more seasons.

Carla Day is a staff writer for TV Fanatic. Follow her on Twitter and on Google+.

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The Big Bang Theory Season 7 Episode 18 Quotes

Well, I told Howie if I wasn't busy I'd spend the night at his mom's. So for God's sake think of something.

Bernadette

He has a very sensitive butt. Well, it's true. I once saw him sit on a bunch of loose change and add it all up.

Leonard