"Burger Betty" is first seen in a surveillance video eating a hamburger in a diner in what appears to be Texas. The subject's MRI reveals some serious pelvic injuries, multiple fractures held in place by metal inserts. She also appears to have dead tissue on her toes, which the team thinks could be a result of frostbite. Bill investigates the demands of extreme winter sports to determine a source of the injuries and Natalie spends time in an industrial freezer to learn more about the causes of frostbite. Meanwhile Dan, a psychologist, runs some tests and determines that the subject is highly self-reliant and independent. Her mental toughness has also been tested to the limit. Skip Palenik, one of America's top particle experts, unearths a possible clue when he detects dog hair that steers the team towards dog sledding. But Natalie also makes headway when she analyzes the specific type of water the subject drinks. Ultimately, the team has a lot of answers, but which ones will help?
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