When Captain Harris bungles an operation to catch the infamous Clown Gang, he is punished by being sent back to the Police Academy to train new recruits.
When the infamous Claw crashes a masquerade party and steals the Queen's crown during her royal visit, it's up to Mahoney and the gang to save the day, while trying to avoid Harris' and Proctor's attempts to shut down Lassard's pet project.
Captain Harris cooks up a hairbrained scheme to induct the Professor's new robots as police officers, replacing Mahoney and crew.
But when Kingpin and his men abduct the Professor and force him to re-program the robots to aid his criminal activities, it's up to our heroes to make things right once again.
The British police call our favorite Academy grads for help, as they set out in search of the Supercar, in high hopes of getting their beloved former leader reinstated.
While on duty at the reception, the grads meet Mahoney's childhood friend Ben, now the hired help, whom bride-to-be Debbie has fallen in love with instead.
Ben's plans to save Debbie from her arranged marriage turn nasty, when the actors originally hired for a faux kidnapping decide to carry it out for real.
Feeling stressed, overworked and underappreciated at the precinct, Hooks applies for, and lands, a new job as sheriff of an old western town.
To put an end to a curse, a museum curator seeks the help of the Academy grads to escort the mummy of an ancient Egyptian king, as it is shipped back to its rightful resting place, via a cruise liner.
The chase leads our heroes to an amusement park, where they scurry through loads of roller coasters, dodgem cars and haunted houses, in hot pursuit of the thugs.
Commandant Lassard opens a new summer camp for underprivileged inner city youths, attended by the likes of rebellious teen Bobby & friends.
Mahoney and crew have a difficult time gaining the youngsters' trust, but they have to unite as a team in order to stop a group of neighborhood criminals from trying to sabotage the camp's activities.
But the Magnificent Mystopholes hypnotises Hightower under the pretense of curing his fear of dentists, while actually using him to steal the three keys to unlock the Cyclops' Eye diamond case, aiding his twisted plot of mass hypnosis.
Dressed as criminals, Mahoney, Jones, Tackleberry & House set up a mock robbery in hopes that Sweetchuck will capture them, showing his brother just how tough he really is.
Master Shiro's former student Flung Hi (I kid you not) is carrying out his plans to harness various energy sources, in his ultimate quest to take over the city.
What he doesn't know is that high-tech criminals are trying to steal top-secret transistors hidden in Nellie's rattle, before Aunt Mona delivers them to the government.
But when baby Nellie wanders out of the building with the rattle, a wild goose chase involving both crooks and cops ensues throughout the city.
The Gamester's attempt to rig the lottery is foiled by Zed, who ends up becoming a millionaire and starts a new life of luxury with his poodle Eggplant.
Meanwhile, three criminals disguise themselves as villains: Dr. Moron, Miss Bomb and Marsupialman, in order to imitate the moves of the bad guys for a robbery.
A little girl named Ginny asks Mahoney and his gang to help her friends to believe in Santa Claus, but first the cadets must prove her innocence after being framed for stealing diamonds by the actual pair of thieves.
Jones becomes a great rocker, but an arrogant and envious musician named Dread Ned wants to get rid of him, to win the prize of a rock concert.
Mahoney, Jones, Zed, Sweetchuck and House discover the incredible Shandar, a magician with a disappearing act, who stole an armored truck and hides out mysteriously in a magic school.
He decides to train with his uncle in the mountains, while one of the Throttle Gang wearing a black knight costume attempts to attack Tackleberry.
With their help, and House's friends, the Fat Boys, they discover the thief is Mr. Ego, a representative of high society, extremely rich, powerful and smart.
Absent: Proctor Zed and Sweetchuck follow in Sherlock Holmes's shoes to catch the diamond bandit after kidnaping the bride Samantha.
Absent: Harris and Proctor John Lurid, a first-order junk environmentalist threatens to destroy the ozone layer with CFCs-loaded rockets, unless the world pays a $50 million ransom.
To get rid of the academy's best policemen on the street, Kingpin commissioned the writer Bagatha Crusties to write a novel like inviting Mahoney and his friends Bleak Island, trying to catch him.
Absent: Harris and Proctor Arriving in Europe, Callahan is coveted by Schubert Von Scheister, a half prince to take up a large inheritance, to make an appeal.