Voltron, Defender of the Universe: Vehicle Voltron

The Voltron Force discovers signs of an ancient civilization on planet Neb. However, the planet is unstable and Nerok is right behind them, ready for an ambush. Hazar meets with his father, Chancellor Mozak, to consider the fate of the Drule Empire. They realize that the empire will lose if they try to attack Earth, and peace is their only long-term option.