With high school a distant memory, Jim and Michelle are getting married — and in a hurry, since Jim's grandmother is sick and wants to see him walk down the aisle — prompting Stifler to throw the ultimate bachelor party. And Jim's dad is reliable as ever, doling out advice no one wants to hear.
Gloria is a free-spirited divorcée who spends her days at a straight-laced office job and her nights on the dance floor, joyfully letting loose at clubs around Los Angeles. After meeting Arnold on a night out, she finds herself thrust into an unexpected new romance, filled with both the joys of budding love and the complications of dating, identity, and family.
Whenever trouble strikes in one of her relationships, single mother Mary Jo Walker and her daughter, Ava, pack up and move to another city, a routine Ava is tiring of. This time, they are helped on their move to San Diego by trucker Jack Ranson. While Ava settles in, getting a leading part in the school play, Jack starts dating Mary Jo but soon reveals himself to be controlling and aggressive. Mary Jo prepares to flee again, angering Ava.
