Ninjago: Masters of Spinjitzu: The Council of the Crystal King

Animated series. Now disguised as the Mechanic, Lloyd follows a Crystal Spider through a secret subway tunnel - the Ninjas track him from above, but the real Mechanic escapes their custody. When Lloyd finds himself at a Crystal Temple with the Council of the Crystal King, Kabuki Mask plays surveillance footage of the real Mechanic and exposes Lloyd's identity... and she also reveals her own as Harumi, Lloyd's evil ex.