Jack's quest to start a baseball league in Eureka is interrupted when something invisible strikes a woman's car and the badly mutilated body of a man is found nearby. The man's wounds are too extensive to have been caused by a mere car accident, and a biometric chip embedded under his skin pegs him as an employee of Global Dynamics. Because of that, Dr. Stark kicks Jack off the case and labels the affair an internal matter for the research facility. Unless Jack can prove that a crime has been committed, he might never learn how or why this man died.
Jack, Deputy Lupo and Henry doggedly continue their investigation with what little evidence Stark's men overlook. They eventually determine that the dead man must have been running at an unbelievable 558 miles per hour to have suffered the exact injuries he did. This being Eureka, Jack guesses that a cutting-edge drug is responsible, and Henry confirms that the man was using some kind of extreme metabolism-booster.
Jack visits the Global Dynamics cafeteria, where he spots a team of Section Five researchers guzzling ridiculous amounts of food and drink — evidence that their metabolisms are unnaturally enhanced. Then Fargo blazes in, moving at impossible speeds as he orders enough food to feed a giant. Fargo admits that he gained this new ability from a mysterious drug which he stole from the Section Five researchers.
Now convinced that something criminal is going on, Allison orders Stark to concede the case to Jack. Jack's first move is to lock up the Section Five team and go home for a quiet evening while they detox. But after ZoŽ brings her new boyfriend, Dylan, home from school, a lightning-fast trespasser blasts through the house, trashing the place and scrawling a threat on the wall. Clearly, Jack has another dangerous drug-user to apprehend.
He interrogates his prisoners, who confess that they stole an advanced form of Ritalin from a medical study at Global Dynamics. They risked altering it in order to make themselves super-fast because they were desperate to finish a vital missile-defence project for the Pentagon on a short deadline. The dead man was a member of their team who lost control of himself while on the drug. Then they name the student intern who gave them access to the drug in the first place: it was Dylan — ZoŽís boyfriend. Juiced on the drug, Dylan's a danger to himself and others. Jack must stop him … but he'll have to catch him first.