A retired spy-turned-full-time homemaker attempts to stop a power-mad supervillain from taking over the planet, and gets some unexpected help from her disagreeable twin step-children in this fourth entry of writer/director Robert Rodriguez's family-friendly adventure series. It's been a long time since former OSS agent Marissa Cortez Wilson (Jessica Alba) went chasing bad guys. These days it's hard enough just to get her precocious stepkids, Rebecca (Rowan Blanchard) and Cecil (Mason Cook), to clean their rooms, and make sure her baby daughter has a full sippy cup. And despite the fact that Marissa's husband, Wilbur (Joel McHale), earns his income chasing spies on TV, he hasn't a clue that his mild-mannered wife was once a cloak-and-dagger woman. Now the nefarious Timekeeper (Jeremy Piven) has hatched a plot for world domination, prompting the OSS to summon Marissa back to active duty. When Rebecca and Cecil discover their stepmother's tightly guarded secret, they realize they might be the only hope for getting her out of a tight jam and foiling the Timekeeper's evil plan. Fortunately Carmen (Alexa Vega) and Juni Cortez (Daryl Sabara) are more than willing to teach Rebecca and Cecil the tricks of the trade, and in no time the two bickering ten-year-olds are wielding hi-tech gadgets and heading out on their first assignment.