'Chuck': Rebecca Romijn joins Season 5, is out to get Team Bartowski

rebecca-romijn-chuck-gi.jpg "Chuck" has just increased its "beautiful blonde secret agent" population by one.

The NBC series, which begins its final season Oct. 21, has signed Rebecca Romijn -- Mystique in the first three "X-Men" movies -- for a guest role as a rogue CIA agent named Robyn Cunnings, EW reports. The character is described as cold, calculating and enamored of harsh interrogation techniques.

Robin and a group of fellow agents are also apparently not happy about Chuck ( Zachary Levi), Sarah ( Yvonne Strahovski) and Co. having taken their spy operation to the private sector. They hatch a plan to frame Chuck for a very serious crime.

Romijn currently stars in the Adult Swim comedy "NTSF:SD:SUV." Her other credits include "Ugly Betty," "Pepper Dennis" and "Eastwick"; she also had a brief cameo in "X-Men: First Class" as an older version of Mystique (played by Jennifer Lawrence).

What do you think of the casting?
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