Sunday September 30 at 10:30pm (M)

In tonight’s episode of ALIAS, Sydney stays undercover and partners with Sark to uncover Rambaldi’s final clue.

Sydney must stay undercover and partner with Sark to track down Rambaldi’s final clue before Prophet Five finds it.

Meanwhile, Vaughn sees daughter Isabelle for the first time, and Rachel discovers Tom’s secret.

ALIAS stars JENNIFER GARNER as Sydney Bristow, VICTOR GARBER as Jack Bristow, RON RIFKIN as Arvin Sloane, CARL LUMBLY as Marcus Dixon, KEVIN WEISMAN as Marshall Flinkman, BALTHAZAR GETTY as Thomas Grace, RACHEL NICHOLS as Rachel Gibson, ELODIE BOUCHEZ as Renee Rienne and AMY ACKER as Kelly Peyton, with DAVID ANDERS as Julian Sark.