Sheldon and Leonard hit the black market looking for helium on The Big Bang Theory. "The Helium Insufficiency" is the sixth episode of the show's ninth season.

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Photo Credit:
CBS/Monty Brinton
Show:
The Big Bang Theory
Episode:
The Big Bang Theory Season 9 Episode 6: "The Helium Insufficiency"
Characters:
Leonard Hofstadter, Sheldon Cooper
Related Photos:
TBBT Photos, Leonard Hofstadter Photos, Sheldon Cooper Photos
Location:
Los Angeles, California
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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.