Harold Finch's (portrayed by Michael Emerson) fiancee, Grace Hendricks (recurring, seasons 1-3,5) is portrayed by Michael Emerson's real-life wife, Carrie Preston.
Of the 103 episodes in this show's run, 71 have a rating of over 9.0, as voted by IMDb users [October 2016]
Showrunner Jonathan Nolan said the writing team decided to make Root a prominent character mainly because of the theme music composer Ramin Djawadi wrote for her. In an interview, he once said "Ramin had written this theme for Root and it was amazing. It's a really fun, mysterious character, but we really wanted to hear that theme again! So when we came back to the [Season 1] finale again, we know where we wanted to go with the character".
The character of Sameen Shaw was introduced on the show with the potential of becoming a regular, but it only happened because she was well received by the audience and the producers were happy with Sarah Shahi's performance.
The opening sequence contains one or two scenes from the current episode, always at the point Finch says, "...victim or perpetrator, if your number's up, we'll find you."