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Episode 4x01: Panopticon (Sep/23/2014)
The Machine finally sends a Number to the undercover Reese and Sam, and Reese tries to convince Finch to help them. When he won't, Reese is forced to go it alone to save two lives.

Episode 4x02: Nautilus (Sep/30/2014)
Reese turns to a reluctant Finch for help with their new Number, a gifted mathematics student who is trying to win a bizarre urban game with a sinister ulterior motive. Meanwhile, Sam pursues her second career as a street thief.

Episode 4x03: Wingman (Oct/07/2014)
Fusco goes undercover as a man desperate to get a date, so he can get close to the new Number, a professional wingman. Meanwhile, Reese tries to impress the new captain, while Root takes Finch on a scavenger hunt on behalf of the Machine.

Episode 4x04: Brotherhood (Oct/14/2014)
When a young brother and sister witness a gangland shooting, they take a half million in drug money and go on the run. Reese goes looking for the team's two new Numbers and finds the Brotherhood after them. Meanwhile, Finch turns to Elias for help.

Episode 4x05: Prophets (Oct/21/2014)
While Reese is forced to undergo therapy for his violent tendencies, Sam, Root, and Finch try to help a pollster who has run afoul of Samaritan.

Episode 4x06: Pretenders (Oct/28/2014)
An unassuming insurance agent becomes a private detective to investigate the apparent suicide of a co-worker's brother, but soon gets in over his head. Meanwhile, Finch travels to Hong Kong to present a paper.

Episode 4x07: Honor Among Thieves (Nov/11/2014)
Finch sends Sam in to infiltrate a gang of thieves whose leader is the team's new Number. Meanwhile, Root helps Finch undermine Samaritan's newest scheme.

Episode 4x08: Point of Origin (Nov/18/2014)
Reese volunteers to teach at the police academy to keep an eye on the team's new Number, a recruit who is spying on her fellow classmates. Meanwhile, Mini launches his plan to get the information he needs to bring Elias down.

Episode 4x09: The Devil You Know (Nov/25/2014)
With Sam on the run from Samaritan, and Martine looking into Fusco's involvement, Reese and Finch are on their own trying to protect Elias from Dominic and his Brotherhood men. But when Dominic captures Elias' friend and bodyguard, Reese discovers that Elias doesn't want his protection.

Episode 4x10: The Cold War (Dec/16/2014)
Samaritan finally offers the Machine a face-to-face meeting... by stopping crime in New York City for a day to demonstrate its power. It then unleashes chaos to prove that humanity is flawed. Meanwhile, Reese and Finch struggle to keep up with the escalating Numbers, and Sam chafes at being concealed from Samaritan.

Episode 4x11: If-Then-Else (Jan/06/2015)
Desperate to stop Samaritan's crash of the stock market, the Machine sends the team in to stop the meltdown. However, even a super-fast computer may not be fast enough to save them all.

Episode 4x12: Control-Alt-Delete (Jan/13/2015)
Control discovers that the new Research division of the ISA is shutting her out from valuable information. When Decima forces her to back down, she continues the investigation on her own... and Reese and Root capture her in a bid to find their teammate Sam.

Episode 4x13: M.I.A. (Feb/03/2015)
Reese and Root investigate a small town in upstate New York that holds the key to Sam's location... and whether she's dead or alive. Meanwhile, Fusco investigates a new Number and runs into former Number Dani Silva.

Episode 4x14: Guilty (Feb/10/2015)
The Machine arranges for Finch to sit on the jury of a man on trial for the murder of his wife. He discovers that someone is trying to fix the trial, and Zoe volunteers her services to help find out who the fixer is. Meanwhile, Reese meets voluntarily with Iris for more therapy sessions.

Episode 4x15: Q&A (Feb/17/2015)
While Reese protects an Internet company transcriber, Claire Mahoney sends a message to Finch asking for his help against Samaritan.

Episode 4x16: Blunt (Feb/24/2015)
The team's new Number is an experienced grifter who ends up stealing from Dominic and discovers that she's in over her head. Meanwhile, Root infiltrates a tech company owned by a former Number.

Episode 4x17: Karma (Mar/10/2015)
The team's new Number is a therapist who has a unique way of bringing closure to his patients. Meanwhile, in the past, Finch ignores the Machine's warnings and tries to kill Corwin for her part in Nathan's death.

Episode 4x18: Skip (Mar/24/2015)
While Reese protects the team's new Number, Finch asks Root for help with Beth. However, he soon discovers that Root has an agenda of her own.

Episode 4x19: Search and Destroy (Apr/07/2015)
A antivirus CEO's life is destroyed when his computers are hacked and his information is exposed to the world. As he tries to put his life back together, Samaritan launches a campaign to eliminate him for good.

Episode 4x20: Terra Incognita (Apr/14/2015)
While pursuing a home invasion mass murder that Carter never closed, Reese finds himself thinking about his former teammate... unaware that death is closing in on him.

Episode 4x21: Asylum(Apr/28/2015)
As Root and Finch follow a lead to Sam, Reese and Fusco try to find Elias and protect him from Dominic before it's too late. Meanwhile, Control questions one of Samaritan's handlers and learns about The Correction.

Episode 4x22: YHWH (May/05/2015)
While Control tries to stop the Correction, Reese, Finch, and Root race against time to save the Machine when Samaritan discovers its location.

Source: TVRage