Tonton Streaming Xiaolin Showdown (2003) S1E6 - Chameleon

Jack kidnaps Kimiko, without the Warriors knowing, and replaces her with his latest invention: the Chameleon Bot. The robot can transform into anyone or anything it wishes, and Jack sends it to the Xiaolin Temple under the guise of Kimiko. His plan is for her to stroll right in and steal all the Warriors' Shen-Gong-Wu.