Alias 5.12: There's Only One Sydney Bristow

From ABC.com:

"In the milestone 100th episode of the award-winning spy drama, Sydney's maternity leave is cut short when she learns that Will has been abducted by her nemesis, Anna Espinosa. Meanwhile, Sloane finds himself one step closer to obtaining the cure for daughter Nadia."

In more detail:

Sloane meets with the Prophet Five leaders in Minsk. In return for Nadia's full recovery, they force him to make Sydney go on a mission. He agrees on the condition that Sydney will not be hurt.

Peyton, who survived Jack's assault in Vancouver, springs Anna Espinosa in return for Anna's help. Later, Anna poses as a witness protection agent to gain entry into Will Tippin's home and tasers him.

At APO, Sloane and Jack show Sydney a video surveillance clip of Will's abduction, and mention that Anna had internal assistance from Prophet Five. Although Sloane "urges" her to stay on leave, she's determined to save Will.

In a hidden location, Peyton's accomplice Burris injects a bomb into Will's neck. Meanwhile, Sloane tells Sydney that Ecehelon has intercepted a call between Yerik Semanko and Anna regarding an exchange at a Moscow club run by the Russian mafia. Sydney leaves her baby with babysitting agents.

In Moscow, Dixon, Rachel and Tom enter the club with Marshall's help. Sydney accesses the club through the roof. Once in the club, the team dons eyeglasses that broadcast x-ray images to Marshall, enabling him to spot guns and money. Later, Rachel flirts with Semanko while Sydney skillfully plants a bug on his collar. As he goes into the VIP room and meets Anna, the APO team overhears that Will is in Room 147.

Syd heads toward Will and confronts Anna. Peyton watches the fight through video surveillance. Anna knifes Syd's arm - and the camera scans Syd, capturing data. Will helps Syd chase off Anna.

In the APO office, Sydney tells Jack that she hated telling Will that Vaughn was dead. Jack reminds her that Vaughn's safety depends on hiding him. When Will visits Syd, an alarm notifies the babysitters. Later, they discover the bomb in Will's head. Suddenly, Syd gets a call from Anna.

Anna asks Syd to hand her Page 47 of the Rambaldi manuscript in exchange for the bomb's deactivation. When Syd notes that handing over the page will not guarantee Will's safety, Marshall suggests that he can build a device that can track the bomb frequency and reverse engineer the activation. The only catch is Will has to be close to the detonator.

On a train In Lisbon, Will asks Sydney to be the best man at his wedding. They then tap into the train's security system and find Anna. To bring Will close to the detonator, Syd meets with Anna for the trade. Syd gives her Page 47, but Anna begins the countdown and Will's head beeps. Syd steals the detonator and stops the countdown. Anna escapes and locks Syd in the car. Suddenly, Syd is showered with red liquid. Anna calls Peyton and confirms that Sydney's DNA is being collected.

Will knocks out Anna and frees Syd. Anna recovers, activates another detonator and throws it off the train and into a lake. Syd and Will dive into the lake. Syd finds the detonator in time to deactivate it and once again save Will's life.

Sloane meets with Peyton and she assures him that Sydney wasn't hurt in any of their experiments. In exchange, she hands Sloane a chemical compound that could save Nadia. Meanwhile, Will and Sydney walk through a park where Syd apologizes for the chaos she's brought him. Will assures her that it is not her fault that evil people that exist, and that he sleeps better knowing that there is only one Sydney who can keep the world safe.

In Moscow, Anna enters a tank filled with red liquid. She emerges with Sydney's face.

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Will Tippin (Bradley Cooper) was back tonight and it was good. I hope he'll be in the remaining episodes. One puzzling thing though. I thought that they (Sydney and Jack) admitted that they knew Vaughn was alive? I hope I heard wrong, though, because if they suddenly "know" this then there's a gap in the story. Apparently he is alive, as we found out last week at the very end. Well, I won't know for sure until I can watch tonight's episode on DVD - probably in the fall.