 It would later be revealed that the current Worms are the second group to reach Earth, a previous group of Worms called the Natives came to Earth 35 years ago before the events of the series.Unlike their aggressive kin, the Natives learned to co-exist with humans with some creating their own human identities.They are also the ones who developed the Masked Rider System and ZECT for the purpose of fighting off the Worms.