Plot: Five years after the events of the first film, Lou Dorchen and Nick Webber have become rich and famous, with Lou becoming a multi-billionaire and Nick being a successful music singer. At Lou's celebratory party, Lou is shot in the groin. Jacob (Lou's son) and Nick drag him to the hot tub time machine and activate it to travel back in time to find and stop the killer. When they awaken they find themselves ten years in the future, where Jacob is in charge of Lou's mansion. After determining that they are in an alternate time-line where Lou's killer is from this future, they go to their friend Adam Yates's home, only to meet his son Adam Yates Stedmeyer (Adam Jr.) who is engaged to a girl named Jill..
Alternative Plot: After their first adventure with the "Hot Tub Time Machine," Lou (Rob Corddry) and Nick (Craig Robinson) are living very well off their ill-gotten gains, while Jacob (Clark Duke) 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.
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