Darkness
S1, E14: Ra's Al Ghul uses the Cortex to turn the power off in Gotham City, then creates a rift between Katana and Alfred by telling her the true reason for her father's death.

S1, E14: Ra's Al Ghul uses the Cortex to turn the power off in Gotham City, then creates a rift between Katana and Alfred by telling her the true reason for her father's death.