The team is on the hunt for a man in his fifties with a large muscular upper body, an intimidating look and an eastern European accent. He's quite fit, but technically obese, and has a huge scar across his back. They think he's a power lifter, so Bill looks into power lifter training regimens before heading off and following a hunch that he's a circus strongman, It turns out he's neither. Meanwhile, Natalie and a trauma surgeon try to figure out how he got his scar and Dan runs a psych profile and determines that the subject is courageous and extremely self-confident. The pieces of the puzzle begin to fall into place when leading trace expert Skip Palenik finds two key substances on the subject's person. The first is a grain of pollen that's native to Arizona or Utah. The second is a greasy mixture of Vaseline and lanolin, which is found to be used by open-water swimmers.