She dreams of Broadway, but instead 18 year old Barrett Wilbert Weed is thrown into the hands of the OSS, destined to be a Spy Kid. During the harrowing physical exhaustion of Spy Kids boot camp, Barrett is oppositely paired with Marnie Robinson, a bright-eyed brunette with determination as sturdy as a log. After the fate of the OSS is at risk from a corrupt evildoer, Barrett and Marnie must go on an adventure that will put behind any kind of life they previously knew.