Watch The Big Bang Theory Online: Season 9 Episode 6

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Veteran actor Michael Rapaport guest-starred on The Big Bang Theory Season 9 Episode 6.

He came on board as a black market dealer. Of what, you may be asking? Of helium! Of course!

The latest installment of this CBS sitcom found Shelton and Leonard growing desperate because there was a nationwide shortage of this gas.

As a result, the characters took rather extreme measures, such as contacting Rapaport's shady dealer.

Did everything work out as planned? Did the scientists get the gas they needed?

Click on the video above, follow its instructions and watch The Big Bang Theory online now to find out!

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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The Big Bang Theory Season 9 Episode 6 Quotes

Bernadette: You know who went on a date the other night? Stewart.
Penny: Oh, good for him.
Bernadette: I thought so too.
Penny: So is she like, homeless or framing him for a crime?

Raj: Why do you need Kripke? Can't you just go to Party City for helium?
Leonard: We'd have to go to every Party City in California.
Howard: Sounds like you on Cinco de Mayo.
Raj: Hey, people were still talking about that party on Siete de Mayo.