Only one member of the League of Impostors has been positively identified by name - Yohan, a duplicate of Maxwell Smart - but it is known that League members have also impersonated Agents 13 and 38, as well as the Chief of CONTROL himself [Episode #63: "The Spy Who Met Himself"]. Although it is not specifically stated, it is possible that Sonja, a 99 lookalike, was also a member of the League [Episode #133: "And Only Two Ninety-Nine"].