Physics Doctoral Candidate (formerly)
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Dennis Kim is a 15 year-old physics prodigy from North Korea whom Dr. Eric Gablehauser hopes to recruit into his department's Ph.D. program. A highly sought after doctoral candidate, he was the valedictorian at Stanford University, graduating within a year-and-a-half, and the youngest recipient of the prestigious Stevenson Award. Dennis lost a year in starting graduate work while his family tunneled out of North Korea, though his grandfather remained behind. As incentives to lure him, Dr. Gablehauser proffers that he may use up to 20% of the grant money he attracts to smuggle his grandfather out of Pyongyang and enlists Sheldon and Leonard to provide a tour of the department to show him why Caltech has the best physics research facility in the country.
Dennis and Sheldon have an antagonistic relationship when the former surpasses the latter in every way. Believing the string theory research (i.e., Sheldon's research) conducted at Caltech to be a dead end, Dennis insults Sheldon by insisting that he will eventually come to the same conclusion and inputs that the whole landscape of false vacuums in string theory could be as large as ten to the five-hundredth power. After Sheldon halts the tour by returning to his office, Dennis makes a keen observation of Sheldon's work on quantum loop corrections scribbled on one of his whiteboards and finds it startling that he hasn’t considered a Lorentz invariant field theory approach. While Sheldon demands that he leave, Dennis Kim excitedly takes note of the Stevenson Award framed near the door inside, but is disappointed to discover that Sheldon was only formerly the youngest recipient at fourteen-and-a-half.
Losing faith in his own research, Sheldon begins searching for a different field of study to the progressively increasing frustration of his friends, prompting the gang to come up with a solution to derail Dennis Kim's work. The gang make arrangements so Dennis can meet girls his age in an attempt to distract him from his intellectual pursuits. The plan succeeds and Dennis is seen kissing a girl and drinking, no longer an intellectual threat to Sheldon.
Dennis Kim has no known relationship to Joyce Kim; Kim is a common Korean family name.