She's baaaack! Shailene Woodley's fearless Divergent Tris continues her good fight in the The Divergent Series: Insurgent, out March 20. "She's fueled by the demons that haunt her," Woodley tells PEOPLE of her character's transformation in the second film in the series. "The loss of her parents and her friend [Will] make her feel like she is unstoppable in her quest for justice."
Tris's partner in crime (or, uh, justice), Theo James's Four, returns to her side to continue battling the power-hungry Jeanine (Kate Winslet). "This movie is about his mission to protect Tris and the broader society, and mixed into that are his own personal demons," James explains. Four and Tris "are two damaged people who are trying to struggle through a war," he adds, "which makes [their relationship] richer and more enticing."
Meanwhile, Winslet's Jeanine will do what she can to take down Four, Tris and anyone else who gets in the way of her climb to the top. "Tris and Jeanine's relationship has become a power game," Winslet says. "Jeanine has a very bizarre and uncomfortable fascination with and admiration for Tris." Off-screen, Winslet also has an admiration for her wardrobe. "It's been really nice being able to wear all the cut, fitted dresses that help create such an intimidating villain. It's made Jeanine feel much more powerful, cattier and nastier," she says.
The Divergent series' bad boy (played by Miles Teller) returns as well – though this time around, his character has a few different dimensions. "His cockiness comes from a place of insecurity," Teller says. "But he's fun because he enjoys giving Tris a hard time, and that's important. You need to have an instigator."
Zoë Kravitz's character starts the film with (SPOILER ALERT) her boyfriend Will dead and her former best friend Tris responsible. "Everyone's in a chaotic place," Kravitz says. "In Divergent, Christina is often the comic relief. She's very funny and sarcastic. In this film, you see a darker side of her."
Tris's brother Caleb, played by Ansel Elgort, becomes a more central character in Insurgent. "Even though Caleb does some pretty dastardly things, Ansel manages to convince us that he believes in some greater good – even if it's at the risk of his own sister's life," says producer Douglas Wick.
Octavia Spencer joins the cast as Johanna, an Amity leader who goes on to help Tris and Four in their fight. "She brought such fierce, strong, compelling female energy to the set," Woodley says. Naomi Watts is a new face in the cast, too, and Woodley teases that "both of their characters have a sense of mystery surrounding them – you can't quite tell if they will be antagonists or protagonists – but their ominous demeanors lend a very exciting element."