The 28-year-old actor won the coveted role — the mysterious Dauntless leader — opposite Shailene Woodley in the upcoming book-to-big-screen adaption.
Just before filming, Theo took on the role of Dauntless boot camp trainer.
“They didn’t know he was playing Four, they thought he was our stunt coordinator,” director Neil Burger shared. “He put them through it.”
Theo added, “I know it sounds ridiculous but it was really quite useful: it helped set a tone for those scenes, being able to live the character a bit. At one point, Shailene was laughing and I got real serious with her and said”—the actor lowers his voice to a menacing whisper— ‘Don’t. Laugh.’ Shai was like, ‘um, are you joking right now?’”