A 4400 terrorist releases a signal at NTAC that makes the men violent, forcing a lockdown of the facility. Lilly questions how the Centre is handling her daughter, and Shawn…

Eph and Fet recon for an all-out assault that Setrakian assures them will finally kill the Master. Gus aligns himself with a strange new force, one that may swing the…

Dutch returns with a plan to broadcast Eph’s warning about the vampiric plague. However, they face a new threat when Eichhorst launches his own attack against the pawn shop. Palmer…

Eph investigates Kelly’s disappearance and struggles with what he finds. Dutch pursues a plan to retaliate against Palmer, and Fitzwilliam makes a surprising choice.

Setrakian, Eph, and Nora formulate a plan to track down the Master using Jim as bait. Eichhorst and Setrakian’s pasts are revealed. At the Luss home, Neeva struggles to protect…

With Nora gone, Eph reluctantly joins Setrakian’s quest in hopes of gathering enough evidence to warrant a citywide quarantine. Fet encounters the unexpected inside the subway tunnels, and a medical…

A secret autopsy demonstrates the bizarre progression of the mystery virus, prompting Jim to make a startling confession. Eph and Nora race to find the father of the youngest victim…

The four survivors begin manifesting strange symptoms, but Eph and Nora’s attempt to quarantine them is thwarted as the disinformation campaign begins. Meanwhile, in jail, Setrakian receives a surprise visit…

When a plane lands in New York City with everyone on board dead, Dr. Ephraim Goodweather, head of the CDC’s Canary Project, and his team are called upon to investigate….

Eph concocts a plan to make and distribute a bioweapon. Gus realizes Angel can be an unlikely ally, and Kelly comes after Nora and Zack.

Eph changes his appearance to leave the city while Nora is left as the reluctant parent for Zack. Dutch and Nora make a deal with Justine to secure Fet’s release…

Eph and Nora finally see their lethal virus in action. Fet takes the security of Red Hook into his own hands while Dutch and Setrakian set off for Staten Island…

Gus and Vaun wage an attack on Palmer as Eph struggles to connect with Zack. Councilwoman Justine Faraldo vows to bring her extermination policies to the other boroughs.

The people of Eureka are being kidnapped and replaced by body-doubles one by one unless Allison, Fargo and Zane can figure out how to avoid capture and save their town.

Eureka is cut off from the world by a malfunctioning experiment that threatens to eradicate the town’s populace.

Fargo is convinced that Holly is still inside of the Matrix computer, but the DOD is determined to wipe its hard drive clean — losing Dr. Marten forever.

Sarah comes home looking for answers, and with the help of Cosima, they begin digging into the origins of the clone experiment. The hunt for answers takes her right into…

Bierko escapes from the transport taking him to Division and uses his last canister of nerve gas for a surprise strike. Jack is forced to work with Henderson to find…

Jack searches for a safe place to land the plane when Logan gives orders to shoot it down. Hayes readies Bierko for a transfer to a secure facility, while Audrey…

Jack captures Henderson and attempts to force him to hand over the recording, but Henderson targets Heller to buy himself more time. Logan confesses his involvement in Palmer’s assassination to…

Jack and Wayne locate a source inside Logan’s administration who has information on Palmer’s assassination. But things get complicated when they learn that Henderson is using leverage to keep her…

Jack pushes Audrey for answers when evidence indicates that she may be involved with the terrorists. Wayne and Aaron flee from a group of gunmen who have orders from Henderson…

Jack bargains with a German intelligence agent in order to find the woman who can lead him to Bierko. Buchanan chafes against the new chain of command as Homeland Security…

Jack and Lynn must take action when they discover that the nerve gas is breaking through the protective seals that are keeping the CTU survivors alive. Chloe wrestles with her…

Jack takes Henderson to CTU for questioning. Once there, he faces an unhappy reunion with his daughter, Kim. Mike appeals to Martha for help as Logan faces pressure from his…

Jack interrogates Henderson’s wife about her husband’s connection to the terrorists. Lynn begs his sister to return his stolen keycard, while Tony regains consciousness and learns of Michelle’s fate. Martha…

Logan wrestles with his conscience when he learns that Martha is riding in the motorcade with the Suvarovs. Audrey convinces Curtis to take action as Lynn continues to abuse his…

Lynn orders Curtis to take Jack into custody for violating presidential orders, but Jack breaks away from Curtis when Nathanson contacts him through Audrey and offers information on the location…

Jack poses as Rossler and manages to trace one of the canisters of nerve gas, but he goes against orders from the president when the terrorists target a shopping mall….

Jack tracks down a man who has a connection to the terrorists. Logan is forced to grant him immunity in exchange for information on their whereabouts. Mike and Martha argue…

Jack contacts Mike and asks for a secret meeting in hopes of gathering evidence against Walt. Martha begs Aaron for help, while a desperate Walt tries to force Logan to…

Jack returns to CTU and has an emotional reunion with Audrey, while Curtis tracks the Russians and the stolen nerve gas. Walt sends in a hit man to silence Jack….

Jack is captured by the terrorists, who use Derek as leverage to force him to compromise CTU’s assault operation. Logan refuses to give into the terrorist demands as the time…

Jack conceals himself inside the airport hanger and surveys the Russian separatists, feeding information to Curtis and his assault team. The terrorists begin executing hostages in an attempt to make…

Jack and Chloe infiltrate Wayne Palmer’s penthouse where David Palmer was assassinated, in the hopes of finding a clue to his murder. Jack convinces Wayne to cooperate and finds some…

As the missile speeds toward its destination, Mandy cuts a deal with Jack and the President to give up Marwan’s location in exchange for a full pardon on all of…

Mandy uses Tony as leverage to try to force Michelle to aid in her escape. A Chinese security operative captures and interrogates one of the CTU agents involved in the…

Jack finds that his efforts to bargain with Marwan for the location of the missile strike are futile. Heller pushes his son for information when CTU discovers that he may…

CTU scrambles to forge an alibi when a Chinese representative produces evidence of American involvement in the raid on their embassy. Audrey gives Jack the cold shoulder, while Palmer and…

After Logan authorizes Palmer to take charge of the crisis, Palmer sanctions Jack and Curtis to infiltrate the Chinese Embassy on a covert operation to capture a suspect. Tony and…