From ABC Medianet:

SYDNEY AND VAUGHN ARE AMBUSHED BY UNKNOWN ASSAILANTS,
LAUREN AND SARK CONTINUE THEIR NEW PARTNERSHIP, AND SLOANE
DIVULGES A DARK SECRET TO DR. BARNETT, ON ABC'S "ALIAS"

The Episode is Told Through the Eyes of Sydney & Vaughn and
Reversed Through Lauren & Sark's Point of View

"Blowback" - In the episode -- told through the eyes of Sydney and Vaughn and then reversed to see how the story unfolds through Lauren and Sark's perspective -- Sydney and Vaughn are ambushed by unknown assailants while trying to retrieve a bomb. Meanwhile, Lauren and Sark continue to solidify their new partnership, Sloane divulges a dark secret to Dr. Barnett (Patricia Wettig) and Marshall shows the strains of new fatherhood, on "Alias," SUNDAY, MARCH 7 (9:00-10:00 p.m., ET), on the ABC Television Network.

"Alias" stars Jennifer Garner as Sydney Bristow, Victor Garber as Jack Bristow, Ron Rifkin as Arvin Sloane, Michael Vartan as Michael Vaughn, Carl Lumbly as Marcus Dixon, Kevin Weisman as Marshall Flinkman, Melissa George as Lauren Reed, Greg Grunberg as Eric Weiss and David Anders as Mr. Sark.

Guest starring are Patricia Wettig as Dr. Barnett and Fritz Michel as vault manager.

"Blowback" was written by Laurence Andries and directed by Lawrence Trilling.

"Alias" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound.

A TV parental guideline will be assigned closer to airdate.

General Spoilers 02/23 - Update on that STEAMY sex scene with Lauren and Sark – turns out it was cut down (as in, trimmed), not cut out altogether. So we will get some “Julian”/Lauren lovin'! I hear they're in some crazy car chase that culminates with them hopping on top of each other in the car … leading to the bedroom. Sloane will SAY that he had an affair with Irina 9 months before Sydney's birth ... he will also have an affair with his shrinky-dink ... and he also has a very secret agenda that will put EVERYTHING he does into question. Djimon Hounsou is back on the set of Alias this week, filming his second episode. And Quentin Tarantino has expressed interest in coming back for more -- turns out he's a big fan of Alias which makes him alllright in my book. Source: Kristin on E!Online