Bouchez is the second new cast member of "Alias" this season. ABC announced last week that Rachel Nichols ("The Inside") will play a CIA technical analyst.
The 32-year-old Bouchez has won two Cesar Awards -- the French equivalent to the Oscars. In 1995 she won the award for most promising actress for her work in Andre Techine's "Wild Reeds"; four years later, she won best actress for "The Dreamlife of Angels."
Her other credits include "CQ," "La Faute a Voltaire" and "Shooting Vegetarians," an independent comedy released earlier this year.
"Alias" begins its fifth season on ABC at 8 p.m. ET Thursday, Sept. 29.