The planet Kra suffered a self destructive nuclear war. Some people, while escaping from the planet Kra, mistakenly landed on Earth in the Milky Way due to damage to the navigation system caused by nuclear impact on the spacecraft. Residing on EarthThere are several strict laws for the Kla people on Earth: they must maintain their purebred nature, prohibit sexual activity with Earthlings, prohibit the transmission of high-tech knowledge to Earthlings, and prohibit violating Earthlings' laws, etcOtherwise, he will be sentenced to capital punishment. The commander always managed to return to the planet of Kra, but this wait was 50 years. Alien Coco fell hopelessly in love with Earthling Zhang Tongshan, triggering a series of love hate relationships. Deputy Commander Henry knew he had no hope of returning and decided to use their high-tech to destroy humanity and completely rule the earth. Disasters are approaching humanity