Season 4 Episode 2 - 超能英雄 and Villains 

When an ex-con is mysteriously slain in an alley, 城堡 and Beckett believe a vigilante is behind the murder. But efforts to identify their suspect are thwarted when they discover that he roams the city in a Superhero costume
密码: 城堡, season 4, episode 2, 超能英雄 and villains, full episode, abc