Justice League S02E09 - Hearts and Minds (1)

Kilowog crashes to Earth, seeking John Stewart's help to rescue other members of the Green Lantern Corps from the psychic, would-be conqueror Despero. He also explains that John's former mentor and lover, Katma Tui, is one of the captives. John goes to confront Despero and is defeated, only for the rebels to rescue him.