In this exclusive preview clip from "The Helium Insufficiency," the sixth episode of the ninth season of *The Big Bang Theory*, Leonard and Sheldon discover that the Large Hadron Collider has broken down, forcing them to travel to Switzerland to fix it. Meanwhile, Penny and Amy decide to play Dungeons & Dragons, while Raj and Howard try to impress some women at a bar.
| Channel | Category | Duration | Views |
|---|---|---|---|
| Music | TV Clip | 00:20 | 437 |
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