The adopted daughter of French revolutionaries, Chameleon traced her lineage and discovered she was the illegitimate half-sister of the Baroness, Cobra's top intelligence officer. When an opportunity arose, she presented herself to the GI Joe team in hopes of helping to thwart the evil actions of her spoiled sister and her aligned Cobra forces. Chameleon is nearly the disguise expert her sister is, often disguised as her sister, especially when attempting to disrupt Cobra operations. She is trained on all equipment her sister is known to be proficient in, in order for the impersonations to be successful for longer periods of time, if need be.