Five months later. Sydney quits the CIA and joins a Black Ops unit called Authorized Personnel Only alongside Dixon, Jack, Vaughn and... Sloane whom for limited immunity ...

Sydney unwillingly teams up with her father to hunt down a modern-day samurai, named Kazu Tamazaki. Meanwhile, Nadia is back home in Argentina and refuses to go back into ...

Sydney must seduce Martin Bishop, a murderous arms dealer in order to track down a stolen NSA code-breaker. Meanwhile, Vaughn fears for Weiss's life, and Sydney and Jack ...

Sydney and Vaughn go undercover to track down a deadly new bio-weapon. Meanwhile, Sydney is concerned about Vaughn not having yet put Lauren behind, and Nadia turns to a ...

Sydney and Vaughn go undercover as an arms dealing married couple in a mock-up setting of American suburbia to find a stolen electro-magnetic pulse weapon that when deton ...

When Sydney gets bitten on the neck by a missing in action CIA agent, she soon finds out that she has been infected by a experiential hallucinogen, causing her to slowly ...

While Sydney and Nadia argue about Nadia's acceptance of Sloane's fatherly concerns, Sloane worries about Nadia's well-being when she and Sydney go undercover as wealthy, ...

Sloane temporarily steps down as director of his APO task force and gives Jack full authority over the next assignment, which involves Anna Espinosa, the former K-Directo ...

While Nadia is in a coma after being shot by Anna, Sark is taken into APO to help them infiltrate the Cadmus Revolutionary Front and retrieve the stolen bomb, but in retu ...

Dixon secretly enlists Sydney to help him prove that Sloane is double-crossing the CIA and using APO to steal the Blackwell Index, a master blackmail list, and to reconst ...

During a mission to Austria, Sydney must protect the life of an American civilian, whom she unintentionally put in danger after she acquires information about a new mini- ...

Nadia puts her own life (as well Sydney's and Weiss's) in danger after failing to unveil her past about her involvement with a dangerous criminal, named Ceasar Martinez f ...

When a mission to Cuba goes wrong, Sydney is attacked and placed in serious danger of being buried alive in a sealed coffin. Back in Los Angeles, Dixon is exposed to a de ...

Vaughn and Sydney, searches for Vaughns father, and the word Nightingale. Getting help from her father, telling him that Vaughns father might still be alive. Jack Bristow ...

On his own and desperate to find out more about his supposedly-dead father, Vaughn is pressured into a rogue operation for an unknown organization in exchange for informa ...

Sydney and Vaughn tell Jack about Sloane's alleged involvement in Vaughn's search for his father and Irina's contract on Sydney's life. After cornering Sloane, they both ...

Nadia's former caretaker, Sophia, has been severely beaten. She contacts Nadia and asks to meet her. Sloane is told by Sophia that she was beaten up, because someone is t ...

Jack's illness has caused him to hallucinate about a cure among other things. As a result, Sydney must recreate the time when Jack was working for the CIA and hid the onl ...

Sydney and the rest of the team finally capture the Sloane impostor and bring him to APO where they question him to find a rare Rambaldi orchid whose pollen has some mira ...

After a tactical group infiltrates the DSR and steals all the Rambaldi artifacts, CIA director Hayden Chase discovers that the alarms at the DSR were disabled from Nadia' ...

Rambaldi's catastrophic endgame begins to fall into place as a giant red ball version of the Circumference/Mueller device is found floating over a large city in Russia, d ...

Jack, Sydney, Irina, Vaughn and Nadia parachute into Sovogda, Russa to dismantle the giant floating red ball of the Circumfrence which is turning people into mindless, re ...