Following the theft of a deadly virus, code named Substance 33, in Turkey, Sydney is forced to partner on a mission with new APO agent Thomas Grace where they and Marshal ...

Four months after Vaughn's murder by the traitorous Gordon Dean and his associate Ivan Curtis, a grief-stricken Sydney teams up with Renée Rienne, a French freelance ass ...

After learning that the man she has known as Michael Vaughn is under investigation and suspected of being a double agent for another secret terrorist group called Prophet ...

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 ...

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 ...

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' ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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- ...

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 ...

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 ...

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 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, ...

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 ...

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 ...

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 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 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 ...

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 ...

Lauren stages a stunning betrayal by impersonating Sydney and blowing up the CIA offices to steal classified materials, and nearly killing Marshall in the process. But Sa ...

With the aid of Katya Derevko and CIA imprisoned security systems designer Toni Cummings, Sydney and Vaughn attempt to track down Sloane and Nadia. But Lauren and Sark ar ...

After finally discovering the identity of the Rambaldi Passenger, who is Sloane's illegitimate daughter, Sydney and Jack seek the aid of Sloane, to track the Passenger do ...

After finding out that Lauren really is working for the Covenant, Vaughn is told by Jack and Sydney to keep up the facade of a happy marriage in order to keep tabs on his ...

Sydney and Jack warn a disbelieving Vaughn about their suspicions of Lauren being the CIA mole. Meanwhile, Kazari Bomani and Sark take possession of the Rambaldi machine ...

Sydney and Vaughn must track Kazari Bomani down to get hold of a piece of the Rambaldi puzzle before the Covenant gets their hands on it. Meanwhile, Jack reveals his susp ...

Sydney attempts to rescue Dixon's kids after they are kidnapped by Sark. Meanwhile, Lauren's status as a double agent for the CIA and the Covenant is put to the test when ...