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CONTEXT

David Underhill is a world-renowned experimental physicist who appears in a single episode of The Big Bang Theory: "The Bath Item Gift Hypothesis" (Season 2, Episode 11), which aired in December 2008 . He is presented as Leonard's perfect antithesis: brilliant, athletic, charismatic, and possessing an overwhelming self-confidence.

He arrives at Caltech as a visiting researcher and asks Leonard to help him with his research on photomultiplier tubes for a new dark matter detector . Leonard, flattered and excited, immediately accepts, unaware that David will quickly become his worst nightmare.

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BIOGRAPHY

David Underhill is an experimental physicist whose work provided the first conclusive evidence for the existence of galactic dark matter, through his observation of high-energy positrons . He has received the prestigious MacArthur Genius Grant, placing him in a category far above Leonard, who only received a consolation prize for new researchers .

Unlike most of the group's physicists, David is not an "indoorsy and pale" type . He is described as tall, handsome, athletic, and collects vintage motorcycles . He is a Black Diamond skier, plays in a rock band, goes to the gym, and can even imitate Stephen Hawking's computer-generated voice .

He is married, but that doesn't stop him from seducing Penny. He takes her on motorcycle rides, shows her the lab, and convinces her she is passionate about science . Penny, charmed, proclaims herself "Queen of the Nerds" and agrees to date him.

Their relationship ends abruptly when Penny discovers photos of David's wife — naked — on his phone. The detail that makes it even more humiliating: David had deleted his wife's photos AFTER taking naked photos of Penny . Penny realizes she is dating a married, lying man and immediately ends their relationship.

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