On tonight's episode of The Big Bang Theory, Summer Glau makes her eagerly awaited cameo as herself on the hilarious nerd sitcom.  We have a preview clip from the upcoming episode entitled "The Terminator Decoupling."

In this clip, Summer Glau first enters the train the boys are riding and they discuss possible reasons for her boarding the train.  As expected, Sheldon's is the most out there and most hilarious:

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