'Divergent's Shailene Woodley believes in the movie's "moral themes" that will "one day manifest".
The 23-year-old star plays the main protagonist, Tris, in the franchises's futuristic dystopia of Chicago where the city is split into four factions and people are segregated by their job titles in society, all food is genetically engineered, and teenagers are injected with a mind-control serum.
But Shailene thinks the movie - which is based on the book of the same name by Veronica Roth - flags issues that humanity is faced with today.
She said: "I do believe in the moral themes that are behind them, which is why I initially said yes. In this movie it talks a lot about genetic manipulation and what that can cause in he future. Right now, our society is at the forefront of our inventive genetic era. It's obviously fictional, but it's worth putting in the minds of young millennials - to think the choices we make today will one day manifest themselves."
Meanwhile, the actress admitted she's relished being part of a film series.
She told SFX: "It was a great decision. The beautiful thing about doing a series is that you establish a family, especially among all of these actors. It's so exciting to see everyone's careers take off, to support one another and have that sense of comfort."