An inept taekwondo instructor struggles with marital troubles and an unhealthy obsession with fellow taekwondo enthusiast Chuck "The Truck" Williams.

Mall security guard Ronnie Barnhardt is called into action to stop a flasher from turning shopper's paradise into his personal peep show. But when Barnhardt can't bring the culprit to justice, a surly police detective is recruited to close the case.

After their first adventure with the Hot Tub Time Machine, Lou and Nick are living very well off their ill-gotten gains, while Jacob still cannot rely on Lou to be a positive role model. When an unknown assailant breaks into Lou's mansion and shoots him, Nick and Jacob take him for another trip in the hot tub. They emerge in the year 2025, where they must figure out who shot Lou and prevent it from happening again.

A divorced writer from the Midwest returns to her hometown to reconnect with an old flame, who's now married with a family.

Four pals are stuck in a rut in adulthood: Adam has just been dumped, Lou is a hopeless party animal, Nick is a henpecked husband, and Jacob does nothing but play video games in his basement. But they get a chance to brighten their future by changing their past after a night of heavy drinking in a ski-resort hot tub results in their waking up in 1986.