In ancient Egypt, peasant Mathayus is hired to exact revenge on the powerful Memnon and the sorceress Cassandra, who are ready to overtake Balthazar's village. Amid betrayals, thieves, abductions and more, Mathayus strives to bring justice to his complicated world.

Robgen industries newest security system is "The J Series Automatic", an android model designed and programmed to protect humans from violent attacks. But one night, an Automatic named J269 discovers a Robgen executive trying to rape a female employee named Nora Rochester. While trying to stop the crime, he inadvertently kills the executive. At this point, J269 then calls Goddard Marx (his creator and a Robgen chairman) to inform him of the incident. Marx tells the android to stay there with Rochester until help arrives, but Marx is intent on sweeping the fiasco under the rug by sending mercenaries to eliminate both J269 and Rochester. Now the two are fugitives on the run from a para-military hit squad.

Rookie FBI agent Jo Dee Foster has been assigned to work on the case of the Psycho Killer, a psycho killer who has psycho-killed over 120 people. But to learn more about his target, he's forced to meet Dr. Animal Cannibal Pizza, a famous doctor turned cannibal who ate pizzas with human body parts. Meanwhile, Jo's girlfriend, Jane Wine, has just stolen $400,000 in cash from her money-hungry boss, Mr. Laurel, so she and Jo can be happy, but gets lost in a horrible storm and stops at the Cemetery Motel, where the owner, Antonio Motel, is dominated by his insane mother.

When A.T.F. agent Nick Adams goes undercover in a prison to unravel the mystery of a fellow agents death there. Warden Pike and his pet goons are involved in all kinds of corrupt activities; dope dealing and gun smuggling to name a few.

The nerds are now in control of the university, as a result of Lewis Skolnick and the rest's actions in the two previous movies. A new generation of sportsmen arrive, however, determined on winning the school back. The principle, himself an ex-nerd fighter, helps them, and the nerds return to suppression. Harold Skolnick needs help from his uncle Lewis, the hero of the first two movies. Lewis, however, are not too proud of his nerd past, and won't reveal any of it, much less help his nephew. However, his wife makes him change his mind, and with help from his friends from the first two movies, they start the fight to win the school back, using classic nerd tricks.

Emperor Spengo sees Marge Nelson and using a giant magnet, kidnaps her and her husband Dick, hoping to make Marge his before blowing up the Earth. The Emperor and other inhabitants of his planet are somewhat less than bright, and Dick begins reliving episodes of Flash Gordon and Buck Rogers in order to rescue Marge, save the Earth, and restore the rightful emperor to the throne.

When vengeful General Francis X. Hummel seizes control of Alcatraz Island and threatens to launch missiles loaded with deadly chemical weapons into San Francisco, only a young FBI chemical weapons expert and notorious Federal prisoner have the skills to penetrate the impregnable island fortress and take him down.

A Secret Service agent battles an arms dealer who is creating a cyborg army.

When someone tries to murder watchmaker Eddy Kay, the incident triggers a barrage of nightmares and flashbacks into a past that isn't his own. Fearing for his sanity, Eddy contacts psychiatrist Dr. Anna Nolmar for help. Anna thinks he's hallucinating until another attack proves the dangers are all too real. The two of them go on the run, trying to discover the truth about Eddie's past and true identity before it kills them.

When an asteroid threatens to collide with Earth, NASA honcho Dan Truman determines the only way to stop it is to drill into its surface and detonate a nuclear bomb. This leads him to renowned driller Harry Stamper, who agrees to helm the dangerous space mission provided he can bring along his own hotshot crew. Among them is the cocksure A.J. who Harry thinks isn't good enough for his daughter, until the mission proves otherwise.