Nick and Jacob use the time traveling hot tub to try to get back to the past after Lou gets shot, but they inadvertently end up ten years in the future, which they must alter if they want to save their present-day environment.
Nick and Jacob use the time. This time is traveling hot tub. This is to try to get back to the past after Lou gets shot. They inadvertently end up ten years in the future. They must alter. They want to save their present-day environment the future.