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The Big Bang Theory (2007 – 2019)

2007 • 12 seasons • Comedy • TV-PG
JustWatch▼ 33#152IMDb8.1/10946,351TMDB79%12,812Rotten Tomatoes—Metacritic—
On September 25, 2026
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Season 3

The Big Bang Theory · S3E15 — The Large Hadron Collision

Feb 8, 2010 · 21 min · 7.7 (54 votes)

Synopsis

For Leonard's visit to CERN, home to the world’s largest and most powerful particle accelerator, the Large Hadron Collider, in Switzerland on Valentine's Day, he is restricted to bringing a single guest.