Legend of the Seeker Episode 18 - "Mirror"

Gwildor, a common thief, uses a magic mirror to change his appearance to that of a D'Haran captain. He also causes two other thieves named Clayre and Frytss to appear like Kahlan and Richard in order to rob the people of Midlands. Upon seeing Richard and Kahlan, the thieves hatch a plan to steal the Sword of Truth. Clayre and Frytss succeed in stealing the sword but are captured by D'Haran soldiers after Gwildor betrays them. Clayre and Frytss escape only to be found by Zedd, who discovers that they are not Richard and Kahlan