In the fourth season finale, a hostage situation arises when the entire team is held captive while they’re investigating the 2006 killings of a family who had just moved into a new house.
Numb3rs 2×24: Hot Shot
Don investigates the murders of two young women found in their cars outside their homes. Their deaths were made to look like drug overdoses, but Don realizes a serial killer is responsible. Meanwhile, Charlie is having bizarre dreams about his parents. In one dream, his deceased mother appears and tells him he has a question to ask her, but he can’t imagine what it could be.
Will And Grace 4×25: A.I.: Artificial Insemination
After Will and Grace decide to have a baby together, obstacles pile up before them, including a missing specimen sample and bungled insemination efforts that have them teetering between artificial and natural means – all leading to mis-conceptions. Meanwhile, when Jack considers giving up his show-business aspirations, until he gets some career advice from a “divine” entity – his idol, Cher. Likewise, married Karen is sorely tempted by the romantic tickling of a rich and natty gentleman.
Boston Legal 3×24: Trial of the Century
Alan and Denny co-council two brother accused of murdering their father. But when Alan predicts a losing verdict, Denny concocts a plan to cast reasonable doubt on their guilt.
Meanwhile, Shirley is furious when Jerry and Clarence take the case of a woman suing a casino for losing money.
South Park 2×18: Prehistoric Ice Man
Kyle falls into an ice hole and when Stan comes to rescue him, they find a frozen man embedded in the ice. The boys pull the ice man out, Mephesto takes the ice man back to his laboratory to thaw him out. He discovers that the ice man has been frozen since 1996. The government wants to get him for their own experiments, but Stan and Kyle free him, so the government hires Steve Irwin (from “Crocodile Hunter”) to track him down.
Weeds 4×13: If You Work for a Living, Why Do You Kill Yourself Working?
Nancy must face the music when the DEA calls her in for questioning.
Nip / Tuck 3×15: Quentin Costa
The Carver strikes at a sorority house. His identity is revealed. Ariel’s dad kidnaps Matt and Cherry. Ariel’s dad forces Matt to make a life threatening decision, while the carver tries desperately to get his last minute revenge. Julia discovers that there might be something wrong with her baby.
Law And Order SVU 6×23: Goliath
After the wife of a police officer claims her husband raped her, Benson and Stabler arrest the man and come close to believing his version of events when he attacks his captain. When another officer murders his wife and attempts to kill himself that same night, the whole force gets involved and soon realises that the two men both recently returned home from Afghanistan, where they were given the drug Quinium, an anti-malarial. With the reluctant help of reporter Sherm Hempell and a base doctor with an attack of conscience, Novak takes on the U.S. army. Stabler has trouble with the case because of his history in the marines.
CSI 7×24: Living Doll (1)
As the CSI’s continue their search for and discover the identity of the “Miniature Killer”, Grissom and Sara’s relationship gets exposed to the rest of the team as she goes missing during the investigation. The “Miniature Killer” is finally captured, but not before a member of CSI becomes the killer’s final victim.
Law And Order SVU 8×22: Screwed
Lake returns to the SVU and works with Tutuola when Tutuola needs to handle some unresolved issues with Darius.
While trying to retrieve a bomb, Sydney and Vaughn are ambushed by unidentified assailants. Meanwhile, Lauren and Sark continue to solidify their new partnership, Sloane divulges a dark secret to Dr. Barnett and Marshall shows the strains of new fatherhood.
Lauren stages a stunning betrayal to steal classified materials from the CIA. Meanwhile, Vaughn comes face to face with his darkest demons in pursuit of his wife; Nadia must decide whether or not she can trust her father, Sloane, in the pursuit of Rambaldi's most priceless artifact; and Sydney receives a shattering revelation that will make her question everything - and everyone - she thought she could trust.
When Sydney is taken into custody by the NSC, Jack and Vaughn have no choice but to ally themselves with Sloane to rescue her. But with only hours to spare before she is forced to undergo a radical surgery to recover her memories, they must put together an extraction team, headed by freelance operative Brill (Richard Roundtree, "Shaft"). Meanwhile, Lauren faces an impossible choice -- side with the NSC, who she wants to believe is doing the right thing, or with her husband.
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 are also in hot pursuit of them in order to uncover the secrets of Rambaldi. Meanwhile, Vaughn's obsession with tracking down Lauren is beginning to consume him, Sydney and Vaughn turn the tables on an old foe, and Katya expresses her attraction to Jack.
After discovering the identity of the Rambaldi "Passenger," Sydney and Jack seek the aid of Sloane, to track the "Passenger" down. Meanwhile, after learning a secret about his father from Thomas Brill, Vaughn is kidnapped and tortured by Lauren and Sark, who are about to track "The Passenger" down themselves.
After finding out that Lauren is working for the Covenant, Vaughn is told to keep up the façade of a happy marriage in order to keep tabs on his wife's activities. But he's in for a shock when he uncovers the truth about Lauren's mother, Olivia. Meanwhile, Jack refuses to help exonerate Sloane of his crimes and put in motion a stay of execution, and a monk discloses the identity of the Rambaldi "Passenger" to Sydney.
Sydney and Jack warn a disbelieving Vaughn about their suspicions of Lauren being the Covenant mole inside the CIA. Meanwhile, Bomani and Sark take possession of the Rambaldi machine, Sydney and Vaughn must stop a Covenant virus that's crippling medical facilities around the world, Sloane's secret is revealed to Jack, and Bomani begins to lose faith in Lauren's ability to carry out her Covenant missions.
Sydney and Vaughn must track Kazari Bomani down to get hold of a piece of the Rambaldi puzzle. Meanwhile, Jack reveals his suspicions to Senator Reed about his daughter Lauren's allegiances, and Vaughn decides what to do about his marriage.
When Dixon's children are kidnapped by The Covenant he faces a tough task. With no choice, he steps down as director and enlists Sydney's help in a desperate plan to safely retrieve his children from Sark. Meanwhile Sloane discovers he has been framed as a Covenant agent. Lauren is put to the test as a double agent when she has to work with her father.
Sydney and Vaughn must convince bomb maker Daniel Ryan that they are part of The Covenant in order to find out where he has hidden one of his devices. But Sydney discovers that her ties to the bomber could lead him on a suicide mission.
While trying to retrieve a bomb, Sydney and Vaughn are ambushed by unidentified assailants. Meanwhile, Lauren and Sark continue to solidify their new partnership, Sloane divulges a dark secret to Dr. Barnett and Marshall shows the strains of new fatherhood.
Sydney and Vaughn are sent to retrieve the Doleac Agenda to gain an advantage over The Covenant. For this, Sydney and Weiss must convince rogue security systems designer Toni Cummings to help the CIA break into a Lethal Response System. Meanwhile, Sark approaches an unlikely ally to kill the Covenant's Cell leaders.
Jack contacts a mysterious woman with ties to Irina to help him free Sydney and Vaughn, who have been captured and face a North Korean firing squad. But Jack is faced with a curious conundrum when the woman tells him that she will not put the rescue plan in motion until he fulfills a favor - assassinate Sloane.
When the Department of Special Research seizes the Rambaldi Cube from the CIA, Sydney thinks she's lost another chance to find out what happened to her missing time. But FBI Director Kendall lets her in on a huge secret, revealing how her destiny has always been on a collision course with Milo Rambaldi.
The identity of the mysterious "St. Aidan" forces Sydney to pull a stunned Will out of witness protection. But the pursuit sends the two old friends on a collision course with Allison -- the woman who ruined both their lives. Meanwhile, a jealous Lindsey arrests Jack and Vaughn as conspirators in Sydney's escape from NSC custody, Sloane, still under pressure from Lindsey, puts a plan in motion to eliminate Sydney, and Dr. Brezzel has an unpleasant run-in with Sark.
After making a shocking discovery in the desert, Sydney agrees to submit to an experimental procedure conducted by an eccentric doctor, designed to retrieve her lost memories. But while Jack and Vaughn look on, Sydney's mind proves surprisingly resistant to letting her remember her missing time -- and the process of recovering it could end up killing her. Meanwhile, Lauren makes a great sacrifice in order to make her alibi believable to Lindsey after breaking Sydney out of NSC custody, and Sloane finds himself boxed in by an unlikely enemy -- one who wants to see Sydney Bristow eliminated permanently
Jack takes drastic measures to ensure that the NSC never finds out the truth about Sydney's murder of a Russian diplomat. But his actions place a heavy strain on Vaughn's marriage, as Lauren gets closer and closer to the truth about Sydney. Meanwhile, Sydney agrees to go on a mission with Sloane in order to thwart plans to obtain the operating system to a deadly weapon -- and she discovers an unlikely ally in the hunt for her missing two years.
First aired: 11/2/2003 Production Code: 3-306
Sydney's emotions are turned inside-out when she comes face-to-face with Allison, Francie's doppelgänger, who was presumed dead but is now a key figure in The Covenant. Meanwhile Lauren's search for Lazarey's murderer leads her closer to discovering a connection to Sydney, and Sydney begrudgingly is assigned as Sloane's CIA handler.
While Vaughn's life hangs in the balance, Lauren butts heads with Sydney after learning the part she played in his stabbing. Meanwhile, Sydney further questions Sloane's allegiances after he is kidnapped by Kazari Bomani, a kingpin in The Covenant; Jack's cover is jeopardized when he meets with Simon to dig up information on Sydney's missing two years; and Marshall is sent on his second mission with Sydney, posing as a high-stakes, southern gambler.
Sydney discovers a link to her missing two years in the form of Simon Walker, the dangerous and sexy leader of a group determined on retrieving deadly biological weapons. Meanwhile, Vaughn struggles with his own feelings of jealousy and longing while Sydney is on her mission, aware of the pressures his job is putting on his marriage to Lauren. Jack takes matters into his own hands to protect his daughter, purposefully revealing Sydney's deadly secret to Dixon in order to preserve her position inside the CIA.
Sydney and Vaughn are reunited again as a team to prevent Sark from destroying the nation's satellite communications system. Meanwhile, Jack must find a way to stop Marshall from uncovering the identity of a familiar murderer. Sydney accompanies Vaughn and Lauren as they meet with Sloane to ask for a favor.
Sydney's search for her past leads to a jailed Sark, but their Q&A is cut short when he becomes the ransom for a pair of abducted CIA scientists, whose kidnappers may be tied to the murder of his father. Jack contacts an old friend of sorts for info on Sloane's new world-peace project, and Vaughn makes a decision about his future as an operative.
Sydney tries to piece together the last two years of her life and discovers the fates of her friends and family. She confronts Vaughn about his marriage and learns the shocking fates of Jack and Sloane. Meanwhile, she is granted temporary CIA clearance on a case that may help her regain her memory.
Numb3rs 2×24: Hot Shot
Will And Grace 4×25: A.I.: Artificial Insemination
South Park 2×18: Prehistoric Ice Man
Weeds 4×13: If You Work for a Living, Why Do You Kill Yourself Working?
Nip / Tuck 3×15: Quentin Costa
Law And Order SVU 6×23: Goliath
CSI 7×24: Living Doll (1)
Law And Order SVU 8×22: Screwed