When Lou gets killed, Nick and Jacob fire up the hot tub time machine to get back to the past, but they inadvertently land in the future with Adam Jr. Now they have to alter the future in order to ...

It's now a dump, but the lads rally for a night of drinking in the hot tub. Somehow, the hot tub takes them back to 1986, on a fateful night for each of them. Maybe if they do everything the same ...