The Big Bang Theory (2007– )
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The Classified Materials Turbulence 

Penny's second date with Stuart has significant implications for Leonard. Howard enlists the guys' help with one of his NASA projects.



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Episode complete credited cast:
Robert Clotworthy ...
Astronaut (voice)
Ground Controller (voice)


Despite how poorly their first and only date ended (albeit the poorness caused by Sheldon), Stuart and Penny are going out on a second date. Not wanting to screw things up, Stuart asks Leonard for advice on Penny's expectations of the date getting "physical". Penny also asks Leonard for advice on how to get Stuart to come out of his shyness shell. Leonard doesn't want Stuart and Penny's relationship to advance, but he doesn't want to lose either as friends. Leonard ends up giving Stuart what he considers some intentionally bad advice. Feeling guilty about it, he tries to find out what happened on their date so that he can clear his conscience. Meanwhile, Howard has completed the International Space Station's "Wolowitz Zero Gravity Human Waste Disposal System" (i.e. their toilet). After it's been deployed to the station, Howard realizes that he made an error in his calculations, and the system will fail within ten flushes. He has to figure out how to fix the problem only using ... Written by Huggo

Plot Summary | Plot Synopsis


Comedy | Romance


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Release Date:

4 May 2009 (USA)  »

Company Credits

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Technical Specs


Sound Mix:


Aspect Ratio:

16 : 9
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Did You Know?


Howard's toilet modifications were tested using his mother's meat loaf. See more »


When Leonard and Stuart discuss dating Penny, Captain Sweatpants can be seen walking past Stuart. When Sweatpants is (more or less) level with Stuart, the camera angle changes and he's suddenly a foot or so behind him. See more »


[first lines]
Sheldon Cooper: Smell that? That's the smell of new comic books.
[takes a deep breath]
Sheldon Cooper: Oh, yes!
Howard Wolowitz: They're on me today, boys.
Rajesh Koothrappali: You're paying? Have you been selling your sperm again?
Leonard Hofstadter: No, I'm celebrating. As we speak, the space shuttle is docking at the International Space Station, where it will deploy the Wolowitz Zero-Gravity Waste Disposal System.
Rajesh Koothrappali: Oh, get over yourself. It's a high-tech toilet.
Leonard Hofstadter: Just think, thanks to your hard work, an international crew of astronauts will boldly go where no man has ...
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Crazy Credits

CHUCK LORRE PRODUCTIONS, #250 For months I've woken up to a mysterious, intermittent banging sound coming from somewhere in my home. I can't tell you how many mornings I groggily walked around in my pajamas searching for its cause. Frustrated by my inability to locate the source of the banging, I falsely accused my ancient refrigerator and began seeking a replacement. But then I caught a break. Rising early one morning for reasons urinary, I stumbled across the real source of the strange noise - - a small, yellow-breasted bird living the a tree next to the kitchen window. Periodically, he would fly to the window, furiously peck at it with his beak, then quickly retreat to a nearby branch. At first I assumed that the morning light caused him to see his reflection and, being of limited intelligence, or filled with self-loathing, attack it. But once again, my initial instinct proved to be wrong. After a long conversation with the bird, I learned that he was banging on the window because he had it in for my refrigerator. I have since apologized to the fridge, but it has been, not surprisingly, cool towards me. Sorry, that really wasn't worth the journey. See more »


Spoofs Apollo 13 (1995) See more »


Big Bang Theory Theme
Composed and Performed by Barenaked Ladies
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User Reviews

The Classified Materials Turbulence was another very funny episode of "The Big Bang Theory"
18 September 2009 | by (Baton Rouge, La.) – See all my reviews

This is another episode of "The Big Bang Theory" from last season that I missed when it first aired so I'm now trying to play catch up before the season premiere next Monday. It's a continuation of a previous episode arc involving a friend of Leonard's named Stuart that I also haven't seen. It seems Stuart and Penny are going on another date, so Leonard decides to tell him to go slow as in glacial. Meanwhile, Howard is trying to fix his space toilet for the Russians so that it doesn't stop after 10 flushes. And Sheldon, not known for a sense of humor, finds constant amusement in all the bathroom jokes...Another pretty hilarious episode of "The Big Bang Theory" that I couldn't stop laughing at. In fact, I rewinded several times just so I could make sure I heard what I heard. This was the last episode before the season finale but since there are several more from last season I've yet to watch, I'm going to seek those out right now...

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