Hanson and Hoffs go undercover in order to put a crack ring out of business. Penhall, working on the same case, returns to squad car and becomes convinced that his new partner, Sgt. James Addabbo, killed a drug pusher.
Dorothy an old girlfriend of Penhall's, who walked out on him two years ago, returns and decides to move in with him. Hanson gets assigned to protect a student with AIDS who is being made to feel unwelcome in class.
The suicide of a popular student, whom Hanson and Penhall had arrested the night before, leaves his family, fellow students and Hanson in a state of depression and forces Penhall to relive bitter childhood memories.
A desperate pregnant girl lies to her parents and the school when she implicates Officer Ioki as the father of her child, when in reality the father is one of her teachers. Meanwhile, the officers rush to find out the truth before Ioki gets fired.
Hoffs and Fuller go undercover to investigate a teacher's shooting at a high school where students and teachers are packing heat. Meanwhile, Hanson learns that his mother is moving in with her boyfriend.
Hanson goes undercover to find a student who is blowing up toilets. Meanwhile, Fuller must convince the higher-ups that the Jump Street program, which is scheduled to be deactivated over the summer, should be reactivated in the fall, and Doug decides it's time to grow up.
Penhall & Hanson go undercover as the McQuaid brothers in a suburban high school, that recently has had inner city kids bused in, to investigate the theft of a Porsche. Meanwhile, Judy must deal with a love-sick teenage boy.
When a small-town teacher refuses to teach the theory of evolution after his son has a near-death experience, Hanson infiltrates the school to try to discover who's behind the recent burning of the science books.
Hanson contemplates leaving the force and leaves town instead of going to a refresher course at the police academy he and Penhall had been assigned to take after they went drag racing to try to catch a hit and run driver.
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