Jim, Michelle, Stifler, and their friends reunite in East Great Falls, Michigan for their high school reunion.

Jim, Oz, Kevin and Stifler are back -- and hornier than ever! After their first year of college, they reunite and rent a beach house for the summer.

While on a date in a fancy restaurant with Michelle, Jim is ready to propose to her. His father calls to inform him that he has the ring. Michelle misinterprets when Jim stalls the question. Jim's dad arrives as Jim is receiving fellatio, and a mishap grasps the restaurant's attention. Jim proposes and Michelle accepts.

On , Laurie Strode accidentally kills a paramedic with whom her brother Michael Myers (Halloween) had swapped clothes. A guilt-ridden Laurie becomes an inmate at the Grace Andersen Sanitarium, where the nurses believe her to be catatonic. Instead, she is preparing for Michael's return. Three years later, on October 31, 2001, Laurie, pretending to be heavily medicated, prepares herself for the inevitable confrontation with her brother. Michael breaches the facility and kills two security guards, as he makes his way to Laurie. After a chase, Laurie lures Michael on to the institution's rooftop. Although he falls into her trap, Laurie's fears of again killing the wrong person get the better of her; when she tries to remove his mask, Michael kills Laurie by stabbing her and throwing her off the roof. Michael returns home to his abandoned childhood house.