The gang from Dorm Daze is back, but this time they're on a cruise ship on a tropical voyage through the high seas. The cruise makes an educational stop at the island of San Paradiso, where the students are supposed to explore an important archaeological site. Things go from normal to crazy as their visit coincides with every other college's spring break. The moment the boat docks, classes are over! For these Billingsley students, their Semester at Sea will be an adventure no one will ever forget.

Single working mom Christine Campbell has just learned that her ex is dating a much younger woman with the same first name. To avoid any confusion, the new girlfriend is dubbed New Christine, which leaves her with the unfortunate nickname Old Christine.