Season 3 · Episode 15 · Overall #55
The Large Hadron Collision
Aired February 8, 2010 Directed by Mark Cendrowski Written by Story by : Chuck Lorre & Steven Molaro & Jim Reynolds | Teleplay by : Lee Aronsohn & Richard Rosenstock & Maria Ferrari
About This Episode
Valentine's Day tests Leonard and Penny's relationship. Sheldon's jealousy over losing Leonard's attention manifests in creative ways.
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