The Jump Street program faces a summer deactivation that could become permanent. Meanwhile, Hanson discovers a kid living in a school boiler room while undercover to find a toilet bomber, Hoffs is offered a job in media relations, and Dorothy tries to force Penhall to grow up.
A public school in a small religious town reports the burning of its biology books. Hanson is sent into the classroom of a well-respected science teacher who has suddenly become adamant about teaching creationism following his son's near-death experience.
Hanson and his girlfriend walk in on a convenience store robbery that results in her tragic death. He enters an emotional and psychological tailspin when the security camera tape reveals he had 3.3 seconds during which he could have prevented the shooting.
Hanson becomes trapped in a private drug clinic where he had himself placed without Captain Fuller's knowledge in order to investigate claims of patient abuse made by Kenny Weckerle, the kid he busted on drug charges in the pilot episode.
Hanson and Penhall are condemned to repeat academy training when Hanson's grievous error while undercover as a street racer results in serious injuries to a hit-and-run suspect. Sensing his life is at a crossroads, Hanson instead leaves town with a free-spirited high school friend to pursue an old flame who's about to get married.moreless
While Hanson and Penhall are assigned to keep watch over a troublesome star during a film shoot, Waxer Thompson escapes custody after a prison bus accident and seeks revenge on Hanson.
Hanson is sent in undercover at Lincoln High, a school that has been on the verge of racial violence since a black principal came in and a quarter of the school's population is now black. Meanwhile, Penhall tries his hand at stand-up comedy.
The Jump Street unit discovers that a boy who was being used as a pawn by his feuding parents faked his kidnapping with the aid of his grandfather to get away from his parents. Hoffs tries to get to the bottom of her parents' separation.