Tarva is a being from the planet of Luris. He was one of the original Six of the Order of Meledon right next to Zordon and others. He decided to betray his allies. As one of the ones who had given part of his essence to the morphing grid he too had the ability to know everything their was about its power. So when a new opportunity arose he made a pack with Rita that he would bring her the power coins for a certain price. The sorceress agreed to this but still had the plan to double cross him. Tarva was only able to retrieve the dragon coin thus proving to not be of any use anymore. Until he divulged one of Zordon’s weaknesses which in turn made it possible for Rita to trap Zordon in a time warp. It seemed like she was winning until the wise sage trapped her in the space dumpster.
It turned out Tarva had been planning to turn on Zordon all along. He just used his so called old friends to tap into the potential of the grid. His thirst for power led to the conquest of many planets in other sectors by using the untapped potential of the morphing grid to fuel his armies and henchmen. He nearly succeeded in his goals but suddenly his powers were depleted he could hardly bend the grid to his will, thanks to the Power Rangers who were protecting it each time a new team was formed. Tarva seeks to gain full access to the morphing grid. He vows to destroy what is left of the Zordon’s rangers and bring theirs and Earth's destruction.