Harley Quinn(1 episode) as Metallo / The Riddler (voice)(1 episode) as The Riddler / Terrorist #2 (voice)(1 episode) as The Riddler / Mr. Isley (voice)(1 episode) as Mayor / Tad (voice)(1 episode) as Mayor / Jor-El (voice)(1 episode) as The Riddler / Stan (voice)(1 episode) as The Riddler / Leslie (voice)(1 episode) as The Riddler / Unloving Guard / Luigi (voice)(1 episode) as The Riddler / Imperceptible man (voice)(5 episodes) as The Riddler (voice)(1 episode) as The Riddler / Student (voice)(1 episode) as The Riddler / Male Nurse / Cop (voice)