Dylan Rhodes O'Brien (born August 26, 1991) is an American actor. His first major role was Stiles Stilinski on the MTV supernatural drama Teen Wolf (2011–2017), where he was a series regular during all six seasons. He achieved further prominence for his lead role of Thomas in the Maze Runner science fiction film trilogy (2014–2018), which led to more film appearances. He played Deepwater Horizon explosion survivor Caleb Holloway in the disaster film Deepwater Horizon (2016), fictional counterterrorist Mitch Rapp in the action thriller American Assassin (2017), and title character in the Transformers installment Bumblebee (2018). He also played the lead in the adventure film Love and Monsters (2020). O'Brien starred opposite Sadie Sink in Taylor Swift's short film All Too Well (2021).