A special forces team thwarts a deadly plot in Sin City and parties accordingly. But when the real threat emerges, they must sober up to save Las Vegas.

It's the day after Halloween in 1988 when four young friends accidentally stumble into an intergalactic battle and find themselves inexplicably transported to the year 2019. When they come face-to-face with their adult selves, each girl discovers her own strengths as together they try to find a way back to the past while saving the world of the future.

A malfunctioning time machine at a ski resort takes a man back to 1986 with his two friends and nephew, where they must relive a fateful night and not change anything to make sure the nephew is born.