Season 3. Episode 6. It’s High Time to Destroy Humanity.

After easily destroying the government a-holes and the aliens who killed her mom, Lenu realizes that she has ass-kicking superpowers. Her rage at her enemies for killing everyone that she’s loved and their continuing efforts to kill her, results in her believing that humanity in general sucks ass. Her solution? Use her superpowers to destroy the world, though she will spare her boyfriend-alien because he’s a good kisser.