The Earth Defenders are the Kaiju chosen by the Grand Cosmic Fairy to defend the Earth from the coming threat. Each Earth Defender is partnered with a human, that human is given the ability to understand Earth Defending Kaiju. The United Nations Defense provides security of Monster Island, the Island where the Earth Defending Kaiju are brought to the live (most of the Kaiju do not have a home or their homes are destroyed by the Invaders or Mutant Horde) hey also have H.E.A.T. keep monitor of the Kaiju. The human partners live at the HEAT HQ, according to Ash they also like to call it a 2nd home.Also there are other defenders on other planets but most have been slain or captured,but 2 alien defenders with their alien partners have fled to Earth to assist the Earth Defenders. The legend of t