The movie takes place in the future and people stop aging at the age of 25. But in order to stay alive, people have to work to buy more time.
So while the rich might get to retire, the poor often just expire.
Justin Timberlake stars as a guy fighting a corrupt system.
"I just saw my character as an everyday man who just gets pushed too far," Timberlake said. "I think those are some of my favorite action movies, is when you have sort of an ordinary person who gets thrown into kind of extraordinary circumstances."
Timberlake continues to expand his acting resume, this time as an action star.
"I don't think it's a bad thing to want to do everything," he said. "When I first read this movie, I don't think that it really hit me that there was going to be as much action in the film as there was.
"We all want to believe that we would be heroic, and so also it's like boyhood fantasies lived out - shooting guns and flipping cars around and kicking ass."
"In Time" will be in theaters Oct. 28.