Tom Hiddleston and Chris Hemsworth in Thor: The Dark WorldTHOR: THE DARK WORLD

As the comic-book demigod Loki, the nefarious thorn-in-the-side to the Avengers and adopted brother to Thor, Tom Hiddleston, in the Marvel Studios movies, exudes a teasing, seductive malevolence. With his sharp, angular features and chilling gaze that suggests he might prefer eating you to killing you, he's a wonderfully unstable and hypnotic screen creation. Yet the brilliance in Hiddleston's interpretation is that his Loki is also so damned charming. The character may forever be planning destruction or plotting revenge - specifically against the golden-haired preferred son with the red cape and hammer - but Hiddleston's bearing is so smooth and relaxed, and his wide grin so infectious, that you almost can't help rooting for him, especially because he also, generally, gets his movies' best jokes.