Person of Interest: Season 2, Episode 21

Zero Day (2 May 2013)

TV Episode  |  TV-14  |   |  Action, Drama, Mystery
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Ratings: 9.5/10 from 1,611 users  
Reviews: 2 user | 1 critic

It's been ten days since the machine has provided a number, which means Carter has had ten days of dead bodies piling up. Finch discovers that a company called Decima is responsible for the... See full summary »


(as Jeffrey Hunt)


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Episode cast overview, first billed only:
Lionel Fusco (credit only)
John Nolan ...
IAB Detective Ed Solis
Opal Alladin ...
Claudia Sugarman
Carter Gill ...
Office Drone
ESU Captain


It's been ten days since the machine has provided a number, which means Carter has had ten days of dead bodies piling up. Finch discovers that a company called Decima is responsible for the virus which is causing these problems of inconsistency. The machine finally does dispense a number, it belonging to Ernest Thornhill, whose business of late has been buying up pay phone companies. As Finch and Reese track Thornhill, who they have yet actually to see, they find out some important information about him and exactly why the machine dispensed his number. But also aware of that fact is Root, who, using her own brand of persuasion, convinces Finch that they need to work together to battle Decima and the virus. Reese becomes aware that Root is back in the picture, he who gets some help from an old acquaintance in tracking Finch and Root. Their competing goals will all come to a head at midnight Eastern time, when the virus is scheduled to do its job. Meanwhile, Carter, in conjunction with ... Written by Huggo

Plot Summary | Plot Synopsis


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Release Date:

2 May 2013 (USA)  »

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Aspect Ratio:

16:9 HD
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Did You Know?


When Root meets Finch at the park, the machine tracks them. Usually, people are tracked with a white box; admins (John and Finch) are tracked with yellow boxes. In this scene, however, both Root and Finch are tracked with yellow boxes. See more »


Harold Finch: Careful what you wish for, Ms. Groves. This communion that you're seeking, it may not be what you think.
Root: This isn't about me. It's about saving the machine, not just from Decima, but from what you did to it. When that phone rings, I'm going to answer it, and together, you and I are going to find the machine and finally set it free.
See more »


References North by Northwest (1959) See more »

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User Reviews

Mind Blowing
5 May 2013 | by (India) – See all my reviews

One of the best episodes this season. Full of twists and turns

Jim Caviezel, you are a beauty. The whole episode keeps us on the edge and it kept me wondering what's gonna happen next. As the seasons unfold a lot of things about the MACHINE are disclosed.

Though I'd really want to see the past footage when Nathan dies and from where did Finch got his limping leg and injured spine.

This was helluva episode, as good as the season finale. Just imagining if the penultimate episode left us on a cliffhanger, what's going to be the finale.

Eagerly looking forward to it. Cheers Jonathan Nolan, one great Television series you have made. It just got renewed for 3rd season too (Excited for that)

Hope this one makes up to 8-9 or 10 seasons...just can't seem to get bored of it. kudos guys, thanks for PERSON OF INTEREST.

26 of 30 people found this review helpful.  Was this review helpful to you?

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