David Underhill

Dr. David Underhill is a recipient and a very successful, with Leonard excited to be working with him. His of  has provided the first conclusive evidence for the existence of   and Dr. Gablehauser said if David wanted to set something up in the photomultiplier lab, Leonard would be able to give him a hand.

After Sheldon and Howard assert that Dr. Underhill made all the work Leonard has done useless, Leonard hypocritically says "the guy was just in the right place, at the right time with the right -shifting reinterpretation of the . He got lucky." Once David approaches Leonard in the cafeteria about their work examining the levels of photomultiplier tubes for a new dark matter detector, Leonard gives him several s to reach him and states he is a big fan.

Ecstatic to go to the with him, Leonard reveals David is a Black Diamond, collects  , plays in a , and is good at  Stephen Hawking's computer generated voice like Howard.

Meanwhile, with his leather jacket, motorcycle, and handsome looks, Penny is (as most of the s she knows are indoorsy and ) to know that David is a  and starts  him, prompting her to state that she is into, is the " of the ", and that she always wanted to  the  -  that Leonard contradicts because he knows that she is not into science, as she has never expressed interest, and she always turned down his offers to provide a tour of the  for the last year and a half, reasoning she had  to attend.

They as she is dismayed to find out he is. He took some  of Penny before he removed the naked pictures of his. When she tells Leonard, at first, all he s is that David was taking naked pictures of Penny. Leonard is confused as to why Penny thinks she is not enough to date him but can date David, and cries, "David Underhill is ten times smarter than me! You'd have to drive a   into his  for me to beat him at ! Next to him, I’m like one of those   who knows how to ask for !" To which Penny retorts, "Dave is not smarter than you. He’s an ."

Trivia
Interestingly enough, Michael Trucco also plays Samuel T. Anders on Battlestar Galactica, of which the guys are avid fans.