Every Power Ranger series uses footage from a japanese counterpart, Super Sentai. While stories tend to differ for the most part (including a series based on nature turned into a space opera) most footage of robots and fight scenes are based on the Japanese footage. And another fun fact is that while Mighty Morphing is the first Power Rangers series, it was based on the sixteenth sentai, another fun fact is that the sentai series did not receive the staple of combining robots until the eighth series, Chouji Sentai Liveman.