"Hot Tub Time Machine" features four main characters, Adam (John Cusack), Jacob (Clark Duke), Nick (Craig Robinson) and Lou (Rob Corddry). John Cusack's role of Adam is most often revered as the most pronounced character in "Hot Tub Time Machine" and among Cusack's top performances.
"Hot Tub Time Machine" follows four friends living miserable lives as they hop into a hot tub that is also time machine. As they travel through time with hopes to visit the past and correct mistakes they've made in their lives, they wind up landing in the future. In a desperate attempt to regain control of their lives, these four friends are faced with the challenge of changing the future to alter the past, which is their present.