One of the few inhabitants of the planet Zephyrus to survive the invasion of the Pollutrax Army, Corvus Crux tapped into the elemental power of Thunder from the lost Griffinzord that was hidden in core of his planet and became the Black Eco Ranger. With his new Ranger powers he followed to Pollutrax Army to Earth, vowing to prevent anymore worlds from being destroyed by pollution as his was. Initially a loner, Black Ranger eventually joined the Power Rangers Eco Force.