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.

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

On the brink of a midlife crisis, 30-something Mike O'Donnell wishes he could have a "do-over." And that's exactly what he gets when he wakes up one morning to find he's 17 years old again. With his adult mind stuck inside the body of a teenager, Mike actually has the chance to reverse some decisions he wishes he'd never made. But maybe they weren't so bad after all.

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.

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

After he flunks a fertility test, a man realizes that the only way he can get his wife pregnant is by robbing a sperm bank to take back the last of the deposits he made there years earlier.

The savage murders of three young children sparks a controversial trial of three teenagers accused of killing the kids as part of a satanic ritual.

Jackie Moon is the owner, promoter, coach, and star player of the Flint Michigan Tropics of the American Basketball Association (ABA), the worst team in the league. In 1976 before the ABA collapses, the NBA plans to merge with the best teams of the ABA at the end of the season. Only the top four teams will make the move and the worst teams will fold. If the Tropics want to make it to the NBA, Jackie Moon must rally his team and start winning.

The adventures of a group of explorers who make use of a newly discovered wormhole to surpass the limitations on human space travel and conquer the vast distances involved in an interstellar voyage.

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.