For some reason, Dylan O'Brien is unwilling to believe Aiden Gillen's assurance that "I only want what's best for you" in this new extended clip from "Maze Runner: The Scorch Trials." It may have something to do with the armed escort and syringes ...

The sequel to the 2014 dystopian sci-fi hit "The Maze Runner," “The Scorch Trials” picks ups with Thomas (O'Brien) and his fellow Gladers faced with their greatest challenge yet: searching for clues about the mysterious and powerful organization known as WCKD. Their journey takes them to the Scorch, a desolate landscape filled with unimaginable obstacles. Teaming up with resistance fighters, the Gladers take on WCKD’s vastly superior forces and uncover its shocking plans for them all.

Director Wes Ball's adaptation of James Dashner's bestselling young-adult novel, “Maze Runner: The Scorch Trials” also stars Kaya Scodelario, Thomas Brodie-Sangster, Ki Hong Lee, Patricia Clarkson, Rosa Salazar, Jacob Lofland, Giancarlo Esposito and Lili Taylor. The film opens Sept. 18.