'The Americans' Season 2 promotes Annet Mahendru and Alison Wright: Nina and Martha will be regulars

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Get ready to see a lot more of Russian double agents and love-starved secretaries in "The Americans" Season 2. Annet Mahendru and Alison Wright have both been promoted to series regulars on FX's Cold War-espionage drama.

Mahendru plays Nina, the "legal" KGB spy turned by Stan Beeman ( Noah Emmerich) at the beginning of Season 1. By the end of the season, however, the beautiful Nina had turned the tables again, confessing her sins to the KGB rezident and becoming a double agent. Her spying -- and her personal relationship with the married Stan -- are likely to be a major feature of "The Americans" in Season 2.

Wright plays Martha, the FBI secretary seduced and then married by "Clark" -- the identity assumed by KGB agent Philip Jennings ( Matthew Rhys) in order to get intelligence out of her. Oblivious to Clark's manipulation and tragically happy in her new relationship, Martha will go into Season 2 as a secretly married woman.

"Annet Mahendru has been a revelation as Nina, bringing the character to life with a rich and subtle depth that keeps you guessing as to what's really percolating under the surface," said executive producers Joe Weisberg and Joel Fields.  "And Alison Wright's portrayal of Martha is heartbreakingly real at every turn.  We are thrilled to add them to our outstanding company of actors."

The two actresses will join another new series regular, Susan Misner (who plays Sandra Beeman), for Season 2.

Focusing on the relationship between a pair of KGB agents ( Keri Russell and Rhys) living as a married American couple, Cold War-era drama "The Americans" has been a welcome success for FX. The show earned an early renewal from the network and will resume production in the fall of 2013.

Photo/Video credit: FX