DinoZaurs (2000)

Around the prehistoric era, an alien race known as the Dragozaurs arrived to consume the lifeforce of Mother Earth. In response, Earth created the Dino Knights, an army of sentient dinosaurs infused with extra lifeforce, to combat the invaders. The battle was fierce, but in the end the Dino Knights were victorious. Circa 2000, the Dragozaurs return to Earth for a second attempt, and the skeletal remains of the Dino Knights are stored in a museum... until two young children in danger, Kaito and Rena, manage to return them back to life. The Dino Knights prepare to defend the Earth against the Dragozaurs, once more.