Barbie and her best friends Teresa and Renee transform from hard-working gymnasts to undercover secret agents. When their amazing gymnastics skills catch the eye of a top-secret spy agency, the girls are soon following clues to a gem-stealing cat burglar, using high-tech gadgets, glam disguises and cute robo-pets to save the day. Barbie and her athletic best friends slip into their smart outfits when a secret intelligence agency wants to use their special skills to stop a series of gem robberies. Will the Spy Squad succeed in this difficult cat-and-mouse game?